Move stuff to vendor

vendor/libsndfile/lib/Win64/pkgconfig/sndfile.pc

@@ -0,0 +1,12 @@
+prefix=c:/devel/target/libsndfile
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: sndfile
+Description: A library for reading and writing audio files
+Requires: 
+Version: 1.0.28
+Libs: -L${libdir} -lsndfile
+Libs.private: Ext/libflac.la Ext/libvorbis.la Ext/libogg.la
+Cflags: -I${includedir}