This will avoid including -I/usr/include/FLAC in `pkg-config --cflags fishsound` since
FLAC/assert.h will collide with system assert.h.

--- a/fishsound.pc.in
+++ b/fishsound.pc.in
@@ -5,7 +5,6 @@
 
 Name: fishsound
 Description: Encode and decode Vorbis, Speex, FLAC audio
-Requires: @fishsound_pkgdeps@
 Version: @VERSION@
 Libs: -L${libdir} -lfishsound
 Libs.private: @VORBIS_LIBS@ @SPEEX_LIBS@ @FLAC_LIBS@