Don't link with libaudclient, which isn't needed by Audacious plugins
(there is a separate audclient.pc file for that!). It only creates a
superfluous dependency on libaudclient in plugins.

Do link explicitly with libaudcore, which is needed by several plugins,
which otherwise would depend on undefined symbols instead of the
libaudcore SONAME.

diff -Nur audacious-2.2-orig/audacious.pc.in audacious-2.2/audacious.pc.in
--- audacious-2.2-orig/audacious.pc.in	2009-11-22 23:43:46.000000000 +0100
+++ audacious-2.2/audacious.pc.in	2010-01-17 21:45:31.739866022 +0100
@@ -21,5 +21,5 @@
 Description: Audacious is a versatile and handy multi platform media player
 Version: @PACKAGE_VERSION@
 Requires: @PC_REQUIRES@
-Libs: -L${lib_dir} @LIBAUDCLIENT_LDFLAGS@
+Libs: -L${lib_dir} -laudcore
 Cflags: -I${audacious_include_dir}