meson: Add missing pc file for gstphotography

This is supposed to be used by apps like Cheese, and is a public
library.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1365>

pkgconfig/gstreamer-photography-uninstalled.pc.in

@@ -0,0 +1,12 @@
+prefix=
+exec_prefix=
+libdir=@playerlibdir@
+includedir=@abs_top_srcdir@/gst-libs
+
+Name: GStreamer Photography, Uninstalled
+Description: GStreamer Photography digital image capture library, uninstalled
+Requires: gstreamer-@GST_API_VERSION@
+Version: @VERSION@
+Libs: -L${libdir} -lgstphotography-@GST_API_VERSION@
+Cflags: -I@abs_top_srcdir@/gst-libs -I@abs_top_builddir@/gst-libs
+

pkgconfig/gstreamer-photography.pc.in

@@ -0,0 +1,12 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@/gstreamer-@GST_API_VERSION@
+
+Name: GStreamer Photography
+Description: GStreamer Photography digital image capture library
+Requires: gstreamer-@GST_API_VERSION@
+Version: @VERSION@
+Libs: -L${libdir} -lgstphotography-@GST_API_VERSION@
+Cflags: -I${includedir}
+

pkgconfig/meson.build

@@ -28,6 +28,7 @@ pkg_libs = [
   'codecparsers',
   'insertbin',
   'mpegts',
+  'photography',
   'player',
   'plugins-bad',
   'sctp',