[depends] - fix target config site script. It wants to set LD_LIBRARY_PATH to the deps dir not to the native buildtools. Found when trying to get ffmpeg gnutls to work. On osx ffmpeg tried to pull in libz from native dir instead of system toolchain because ld_library_path was set wrong
[depends/config.site] - don't allow pkgconfig to sniff pc files from the other site ...