*) Configure: fixed style of include directories.

*) Configure: fixed GeoIP library detection.

*) GeoIP: IPv6 support.  When using IPv6 databases, IPv4 addresses are
   looked up as IPv4-mapped IPv6 addresses.  Mostly based on a patch
   by Gregor Kališnik (ticket #250).

*) GeoIP: removed pseudo-support of "proxy" and "netspeed" databases.

*) Access log: fixed redundant buffer reallocation.  Previously a new
   buffer was allocated for every "access_log" directive with the same
   file path and "buffer=" parameters, while only one buffer per file
   is used.

*) Reopening log files code moved to a separate function.  The code
   refactored in a way to call custom handler that can do appropriate
   cleanup work (if any), like flushing buffers, finishing compress
   streams, finalizing connections to log daemon, etc..

*) Access log: the "flush" parameter of the "access_log" directive.

*) Configure: added the NGX_ZLIB define.  This was introduced for
   conditional compilation of the code that requires the zlib library.

*) Access log: the "gzip" parameter of the "access_log" directive.
   Note: this requires zlib version 1.2.0.4 or above to work.

*) The data pointer in ngx_open_file_t objects must be initialized.
   Uninitialized pointer may result in arbitrary segfaults if access_log
   is used without buffer and without variables in file path.
   Patch by Tatsuhiko Kubo (ticket #268).

On Mac OS X system toolchain by default prefers include files
from /usr/local/include, but libraries from /usr/lib.  This might result in
various problems, in particular the one outlined below.

If the PCRE library is installed into /usr/local/, this results in pcre.h
being used from /usr/local/include (with PCRE_CONFIG_JIT defined), but
libpcre from /usr/lib (as shipped with the OS, without pcre_free_study()
symbol).  As a result build fails as we use pcre_free_study() function
if we try to compile with PCRE JIT support.

Obvious workaround to the root cause is to ask compiler to prefer
library from /usr/local/lib via ./configure --with-ld-opt="-L/usr/local/lib".
On the other hand, in any case it would be good to check if the function
we are going to use is available, hence the change.

See thread here for details:
http://mailman.nginx.org/pipermail/nginx-devel/2012-December/003074.html

Prodded by Piotr Sikora.

*) Fixed build with embedded perl in certain setups (ticket #48).

*) Brought the link to ngx_http_perl_module documentation up to date.

*) Configure: help updated to list upstream keepalive and least_conn.
   Patch by Joshua Zhu.

*) Configure: additional test for ExtUtils::Embed perl module presence.
   Now perl configure will correctly fail if ExtUtils::Embed perl module
   is not present in the system (found on Amazon Linux AMI, as of
   release 2012.03).

Configure: fixed make macros to use parentheses instead of braces.
Parentheses are more portable, in particular they are understood by
nmake while braces aren't.

*) Fixed build with Visual Studio 2005 Express.

   It is available via winetricks which makes it still usable, and has
   an old crtdefs.h which uses _CRT_SECURE_NO_DEPRECATE instead of
   _CRT_SECURE_NO_WARNINGS to suppress warnings.

   Reported by HAYASHI Kentaro,
   http://mailman.nginx.org/pipermail/nginx-devel/2012-August/002542.html

*) Configure: provide inflate() when building zlib on win32.

*) Helper target "win32" to run configure for win32 builds.

*) Updated zlib used for win32 builds.

*) Fixed spelling of "endianness", and called it "byte ordering" in the
   user visible part.

*) Fixed return type of ngx_strerror_init().

*) Fixed a harmless error in spelling of "Connection: close" when computing
   the response header length.

*) Style.

*) Added code to look up Google perftools in /opt/local/, for MacPorts.

Steps to reproduce:

./configure --with-cc="gcc46" --with-cc-opt="-Wall -Werror -O2"