Auto: mirroring installation structure in build tree.

This makes the build tree more organized, which is good for adding new
stuff. Now, it's useful for example for adding manual pages in man3/,
bu

Auto: mirroring installation structure in build tree.

This makes the build tree more organized, which is good for adding new
stuff. Now, it's useful for example for adding manual pages in man3/,
but it may be useful in the future for example for extending the build
system to run linters (e.g., clang-tidy(1), Clang analyzer, ...) on the
C source code.

Previously, the build tree was quite flat, and looked like this (after
`./configure && make`):

$ tree -I src build
build
├── Makefile
├── autoconf.data
├── autoconf.err
├── echo
├── libnxt.a
├── nxt_auto_config.h
├── nxt_version.h
├── unitd
└── unitd.8

1 directory, 9 files

And after this patch, it looks like this:

$ tree -I src build
build
├── Makefile
├── autoconf.data
├── autoconf.err
├── bin
│ └── echo
├── include
│ ├── nxt_auto_config.h
│ └── nxt_version.h
├── lib
│ ├── libnxt.a
│ └── unit
│ └── modules
├── sbin
│ └── unitd
├── share
│ └── man
│ └── man8
│ └── unitd.8
└── var
├── lib
│ └── unit
├── log
│ └── unit
└── run
└── unit

17 directories, 9 files

It also solves one issue introduced in
5a37171f733f ("Added default values for pathnames."). Before that
commit, it was possible to run unitd from the build system
(`./build/unitd`). Now, since it expects files in a very specific
location, that has been broken. By having a directory structure that
mirrors the installation, it's possible to trick it to believe it's
installed, and run it from there:

$ ./configure --prefix=./build
$ make
$ ./build/sbin/unitd

Fixes: 5a37171f733f ("Added default values for pathnames.")
Reported-by: Liam Crilly <liam@nginx.com>
Reviewed-by: Konstantin Pavlov <thresh@nginx.com>
Reviewed-by: Andrew Clayton <a.clayton@nginx.com>
Cc: Andrei Zeliankou <zelenkov@nginx.com>
Cc: Zhidao Hong <z.hong@f5.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>

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Tests: using modules in Go.

Go: fixing tests for Go 1.16.

In Go 1.16, the module-aware mode is enabled by default; to fall back to
previous behavior, the GO111MODULE environment variable should be set to
'auto'.

Details: http

Go: fixing tests for Go 1.16.

In Go 1.16, the module-aware mode is enabled by default; to fall back to
previous behavior, the GO111MODULE environment variable should be set to
'auto'.

Details: https://golang.org/doc/go1.16

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Go: adding main configure CFLAGS and LDFLAGS to module build flags.

This makes ASAN buildbot workers to work out-of-the-box.

Go: changing import name for "unit.nginx.org/go".

This patch includes packaging changes - update unit-go installation
directory.

Go: moving source files to the root of the project.

This patch includes packaging changes related to files move.

Go: installing go module for tests into build directory.

Go: linking against libunit.

Introducing websocket support in router and libunit.

Improvement and unification of version processing in build scripts.

This also eliminates expressions that incompatible with BSD make, thus fixing
installation of Node.js module on FreeBSD (broken by

Improvement and unification of version processing in build scripts.

This also eliminates expressions that incompatible with BSD make, thus fixing
installation of Node.js module on FreeBSD (broken by dace60fc4926).

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Go: fixed module installation, broken in ed8b1aaefdd1.

Added the nxt_unit_version.h dependency.
This closes #214 issue on GitHub.

Unit application library.

Library now used in all language modules.
Old 'nxt_app_*' code removed.

See src/test/nxt_unit_app_test.c for usage sample.

Making Go package source distributable and renaming to 'nginx/unit'.

All header files are copied to Go package sources. As the result,
package can be (re-)build when required.

This closes #23 issu

Making Go package source distributable and renaming to 'nginx/unit'.

All header files are copied to Go package sources. As the result,
package can be (re-)build when required.

This closes #23 issue on GitHub.

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Fixed permissions for Go sources.

In particular, it resolves a number of errors and warnings
reported by rpmlint(1).

Introducing install & uninstall Makefile targets.

Go: fixed splitting recipe line with newer gmake.

Use double quotes to quote a string with the backslash/newline pair.
Newer gmake versions, such as GNU Make 4.1, do not remove the backslash
from a

Go: fixed splitting recipe line with newer gmake.

Use double quotes to quote a string with the backslash/newline pair.
Newer gmake versions, such as GNU Make 4.1, do not remove the backslash
from a string quoted with single quotes, which results in an extraneous
backslash passed to the shell and, eventually, to the Go compiler.

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nginext has been renamed to unit.

Moving generating CGO header file to the make stage.

The process type enum exposed to go module.

Using NXT_GO variable instead of explicit go.

Store and use NXT_LIBRT for go module.

Separation of module prerequisites for 'all' target in Makefile.

To avoid using sed -i.

Added configure and command line option --help.

The new module configuration interface.

Configuration and building example:

./configure
./configure python
./configure php
./configure go
make all

or

./configure
make nginext
./co

The new module configuration interface.

Configuration and building example:

./configure
./configure python
./configure php
./configure go
make all

or

./configure
make nginext
./configure python
make python
./configure php
make php
./configure go
make go

Modules configuration options and building examples:

./configure python --module=python2 --config=python2.7-config
make python2

./configure php --module=php7 --config=php7.0-config
--lib-path=/usr/local/php7.0
make php7

./configure go --go=go1.6 --go-path=${HOME}/go1.6
make go1.6

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