Use NGX_FILE_ERROR for handling file operations errors.

On Win32 platforms 0 is used to indicate errors in file operations, so
comparing against either -1 or NGX_OK is not portable.

This was not much of an issue in patched code, since only ngx_fd_info() test
is actually reachable on Win32 and in worst case it might result in bogus
error log entry.

Patch by Piotr Sikora.

The crypt_r() function returns NULL on errors, check it explicitly instead
of assuming errno will remain 0 if there are no errors (per POSIX, the
setting of errno after a successful call to a function is unspecified
unless the description of that function specifies that errno shall not
be modified).

Additionally, dropped unneeded ngx_set_errno(0) and fixed error handling
of memory allocation after normal crypt(), which was inapropriate and
resulted in null pointer dereference on allocation failures.

This will result in alphabetical sorting of included files if
the "include" directive with wildcards is used.

Note that the behaviour is now different from that on Windows, where
alphabetical sorting is not guaranteed for FindFirsFile()/FindNextFile()
(used to be alphabetical on NTFS, but not on FAT).

Approved by Igor Sysoev, prodded by many.

*) Core: added debug logging of writev() in ngx_write_chain_to_file().

*) Core: fixed ngx_write_chain_to_file() with IOV_MAX reached.

   Catched by dav_chunked.t on Solaris.  In released versions this might
   potentially result in corruption of complex protocol responses if they
   were written to disk and there were more distinct buffers than IOV_MAX
   in a single write.

Fixed failure to start cache manager and cache loader processes
if there were more than 512 listening sockets in configuration.

Worker processes are now made aware of their sequential number needed
to select CPU affinity mask.  This replaces a workaround from r4865.

*) Made sure to initialize the entire ngx_file_t structure.
   Found by Coverity.

*) Correct plural form for "path" in the whole source base.

*) Removed conditional compilation from waitpid() error test.

   There are reports that call to a signal handler for an exited process
   despite waitpid() already called for the process may happen on Linux
   as well.

*) Style, parentheses instead of braces in misc/GNUMakefile.

This fixes unwanted/incorrect cpu_affinity use on dead worker processes
respawn.  While this is not ideal, it's expected to be better when previous
situation where multiple processes were spawn with identical CPU affinity
set.

Reported by Charles Chen.

*) Resolver: fixed possible memory leak in ngx_resolver_create().

*) Explicitly ignore returned value from unlink() in ngx_open_tempfile().

*) Explicitly ignore returned value from close() in ngx_event_core_init_conf().

*) Added three missing checks for NULL after ngx_array_push() calls.

*) Crypt: fixed handling of corrupted SSHA entries in password file.

*) Mark logically dead code with corresponding comment.

Found by / prodded by Coverity.

*) 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.