links privately to lib/pulseaudio/libpulse{common,core}-X.Y.so

--- libpulse.pc.in.orig	Wed Sep 26 13:27:01 2012
+++ libpulse.pc.in	Tue Jan  1 11:56:50 2013
@@ -7,6 +7,6 @@ modlibexecdir=@modlibexecdir@
 Name: libpulse
 Description: PulseAudio Client Interface
 Version: @PACKAGE_VERSION@
-Libs: -L${libdir} -lpulse @PTHREAD_LIBS@
+Libs: -L${libdir} -lpulse @PTHREAD_LIBS@ -Wl,-rpath,${libdir}/pulseaudio
 Libs.private: -L${libdir}/pulseaudio -lpulsecommon-@PA_MAJORMINOR@
 Cflags: -I${includedir} -D_REENTRANT