Added new git-gui library files to rpm spec

"make rpm" breaks without these files.

Signed-off-by: Quy Tonthat <qtonthat@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/git.spec.in b/git.spec.in
index 9de655c..16148d4 100644
--- a/git.spec.in
+++ b/git.spec.in
@@ -163,6 +163,7 @@
 %defattr(-,root,root)
 %{_bindir}/git-gui
 %{_bindir}/git-citool
+%{_datadir}/git-gui/
 # Not Yet...
 # %{!?_without_docs: %{_mandir}/man1/git-gui.1}
 # %{!?_without_docs: %doc Documentation/git-gui.html}