[pitivi] bin: Do not build GI and PyGobject if not necessary

[Thibault Saunier <tsaunier src gnome org>]

commit 306e8804ee1abaee6fab0ef539be266865c0e62a
Author: Thibault Saunier <thibault saunier collabora com>
Date:   Wed Oct 2 21:43:12 2013 +0200

    bin: Do not build GI and PyGobject if not necessary

 bin/pitivi-git-environment.sh |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/bin/pitivi-git-environment.sh b/bin/pitivi-git-environment.sh
index 3232f8a..3a44814 100755
--- a/bin/pitivi-git-environment.sh
+++ b/bin/pitivi-git-environment.sh
@@ -39,12 +39,16 @@ else
   echo "glib is up to date, using the version already available."
 fi
 if pkg-config gobject-introspection-1.0 --atleast-version=$GOBJECT_INTROSPECTION_MINIMUM_VERSION; then
-  echo "gobject-introspection-1.0 is up to date, but we are using a local build because you might want to 
fix bugs if you find any."
+  echo "gobject-introspection-1.0 is up to date, not building."
+else
+  MODULES_CORE="${MODULE_GLIB} gobject-introspection"
 fi
+
 if python2 -c "import gi; gi.check_version('${PYGOBJECT_RELEASE_TAG}')" &> /dev/null; then
-  echo "pygobject is up to date, but we are using a local build because you might want to fix bugs if you 
find any."
+  echo "pygobject is up to date, not building"
+else
+  MODULES_CORE="${MODULE_GLIB} pygobject"
 fi
-MODULES_CORE="${MODULE_GLIB} gobject-introspection pygobject"
 
 # The following decision has to be made before we've set any env variables,
 # otherwise the script will detect our "gst uninstalled" and think it's the