Filter standard library directories from $SVN_ZLIB_LIBS obtained by pkg-config.
Filter standard library directories from $SVN_ZLIB_LIBS obtained by pkg-config.

Before:
$ grep ZLIB config.log
SVN_ZLIB_INCLUDES='-I/usr/include'
SVN_ZLIB_LIBS='-L/usr/lib -lz'

After:
$ grep ZLIB config.log
SVN_ZLIB_INCLUDES='-I/usr/include'
SVN_ZLIB_LIBS='-lz'

* build/ac-macros/zlib.m4: After detecting zlib via pkg-config, filter out
   standard library directories to avoid potentially picking up conflicting
   libraries from there, e.g. when using self-compiled dependencies installed
   in non-standard locations.
   (We do this for all our dependencies, not just zlib, because libtool...)


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1769973 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion