Add the appsrc/appsink directory to the Libs in the uninstalled
pkgconfig file so that one can build against it.
Fixes #579129
Version: @VERSION@
Requires: gstreamer-@GST_MAJORMINOR@
-Libs: -L${libdir}/audio -L${libdir}/cdda -L${libdir}/fft -L${libdir}/floatcast -L${libdir}/interfaces -L${libdir}/netbuffer -L${libdir}/riff -L${libdir}/rtp -L${libdir}/rtsp -L${libdir}/sdp -L${libdir}/tag -L${libdir}/pbutils -L${libdir}/video
+Libs: -L${libdir}/audio -L${libdir}/cdda -L${libdir}/fft -L${libdir}/floatcast -L${libdir}/interfaces -L${libdir}/netbuffer -L${libdir}/riff -L${libdir}/rtp -L${libdir}/rtsp -L${libdir}/sdp -L${libdir}/tag -L${libdir}/pbutils -L${libdir}/video -L${libdir}/app
Cflags: -I${includedir} -I@srcdir@/../gst-libs
libraries=audio cdda fft floatcast interfaces netbuffer riff tag pbutils video