[gitg] Use $(GTK_UPDATE_ICON_CACHE)

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 1a7665f5d0f626edc4c8e034e68a98d639812dd6
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sun Jan 5 16:58:31 2014 +0100

    Use $(GTK_UPDATE_ICON_CACHE)

 data/icons/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/icons/Makefile.am b/data/icons/Makefile.am
index 09978bb..f840849 100644
--- a/data/icons/Makefile.am
+++ b/data/icons/Makefile.am
@@ -10,7 +10,7 @@ data_icons_public_icons = \
        hicolor_apps_256x256_gitg.png \
        hicolor_apps_512x512_gitg.png
 
-data_icons_gtk_update_icon_cache = gtk-update-icon-cache -f -t
+data_icons_gtk_update_icon_cache = $(GTK_UPDATE_ICON_CACHE) -f -t
 
 data-icons-update-icon-cache:
        @-if test -z "$(DESTDIR)"; then \