Add gstreamer CFLAGS and LIBS to tracker plugin build.
Add gstreamer CFLAGS and LIBS to tracker plugin build.

svn path=/trunk/; revision=360

GNOME/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,luisbg/rygel,GNOME/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel