As part of the re-organisation of Cogl; move clutter/pango to be part of the cogl sub-project.
pango-renderer.h. In versions prior to 1.18.4 pangocairo.h does not include pango-renderer.h
Bug 1215 - Move the Pango renderer to the public API * clutter/pango/*: Rename PangoClutter -> CoglPango. * clutter/Makefile.am: * clutter/clutter-backend.c: * clutter/clutter-entry.c: * clutter/clutter-label.c: * clutter/clutter-main.[ch]: * clutter/clutter-private.h: Update the users of the Pango renderer API. * README: Update release notes.