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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Respecting AR environment variable to configure ar binary.

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.

Removed -mmacosx-version-min option.

Enabled exporting symbols for OpenBSD.

Added Perl support.

Fixed DragonFly BSD shared memory implementation.

Enabled exporting symbols for NetBSD.

Supported linking with -lrt on BSD systems.

OpenBSD lacks support of librt.

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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Initial version.