add PKG_CHECK_MODULES to acinclude.m4
add PKG_CHECK_MODULES to acinclude.m4

svn path=/trunk/vorbis/; revision=9639

ShiftMediaProject/vorbis,eidy/vorbis,emscripten-ports/Vorbis,ShiftMediaProject/vorbis,ksophocleous/vorbis,nicolaichuk/vorbis,eidy/vorbis,ShiftMediaProject/vorbis,emscripten-ports/Vorbis,emscripten-ports/Vorbis,mwgoldsmith/vorbis,erikd/vorbis,ksophocleous/vorbis,felipebetancur/vorbis,ksophocleous/vorbis,ksophocleous/vorbis,mwgoldsmith/vorbis,felipebetancur/vorbis,nicolaichuk/vorbis,mwgoldsmith/vorbis,felipebetancur/vorbis,emscripten-ports/Vorbis,mwgoldsmith/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,youfearm3/vorbis,eidy/vorbis,erikd/vorbis,youfearm3/vorbis,ShiftMediaProject/vorbis,nicolaichuk/vorbis,ShiftMediaProject/vorbis,youfearm3/vorbis,erikd/vorbis,eidy/vorbis,youfearm3/vorbis,nicolaichuk/vorbis,erikd/vorbis