introspection: Build fixes

introspection: Build fixes

This patch merges in substantial work from
Emmanuele Bassi <ebassi@linux.intel.com>

* Use new introspection --include-uninstalled API since we don't want
  to try to find the clutter-1.0.pc file before it's installed.
* Use --pkg-export for Clutter-1.0.gir, since we want the .gir file to
  contain the associated pkg-config file.
* Drop the use of --pkg for dependencies; those come from the associated
  .gir files.  (Actually, --pkg is almost never needed)
* Add --quiet

http://bugzilla.clutter-project.org/show_bug.cgi?id=2292