Consistently name cogl-gst pkg-config files

This makes sure we install a cogl-gst-1.0.pc and
cogl-gst-2.0-experimental.pc file consistent with other sub-libraries
such that cogl-1.x packages can be parallel installed with cogl master.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

cogl-gst/Makefile.am

@@ -60,8 +60,8 @@ libgstcogl_la_LDFLAGS =	\
 	-avoid-version -no-undefined		\
 	$(NULL)
 
-
-pc_files = cogl-gst.pc
+pc_files = cogl-gst-1.0.pc \
+	   cogl-gst-2.0-experimental.pc
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = $(pc_files)

cogl-gst/cogl-gst-1.0.pc.in

@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+apiversion=1.0
+requires=@COGL_PKG_REQUIRES@ cogl-1.0
+
+Name: Cogl
+Description: A GStreamer integration library for Cogl
+Version: @COGL_1_VERSION@
+Libs: -L${libdir} -lcogl-gst
+Cflags: -I${includedir}/cogl
+Requires: ${requires}

cogl-gst/cogl-gst-2.0-experimental.pc.in

@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+apiversion=1.0
+requires=@COGL_PKG_REQUIRES@ cogl-1.0
+
+Name: Cogl
+Description: A GStreamer integration library for Cogl
+Version: @COGL_1_VERSION@
+Libs: -L${libdir} -lcogl-gst
+Cflags: -I${includedir}/cogl
+Requires: ${requires}

configure.ac

@@ -1473,7 +1473,8 @@ cogl-path/Makefile
 cogl-path/cogl-path-1.0.pc
 cogl-path/cogl-path-2.0-experimental.pc
 cogl-gst/Makefile
-cogl-gst/cogl-gst.pc
+cogl-gst/cogl-gst-1.0.pc
+cogl-gst/cogl-gst-2.0-experimental.pc
 cogl-gles2/Makefile
 cogl-gles2/cogl-gles2-1.0.pc
 cogl-gles2/cogl-gles2-2.0-experimental.pc