This way, building the minsrc tarball doesn't require multiple versions
of Automake to be installed. (Most things were at the 1.11 version, but
some were at the 1.14 version.)
Building minsrc should now work just fine.
1) Revert "Reintroduce patch for building local libvorbis with local libogg." (r12914)
2) Remove acinclude.m4 and regenerate autotool files to use a newer
pkg-config checking macro to get the override facility.
3) Override pkg-config check for libogg by specifying OGG_CFLAGS and OGG_LIBS.
