[gnome-control-center] common: fix parallel build race

[Michael Catanzaro <mcatanzaro src gnome org>]

commit fa9ea59ae4e3f9688b3b6d70864169eaf3b4a027
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Sep 9 19:28:22 2016 -0500

    common: fix parallel build race

 panels/common/Makefile.am |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/panels/common/Makefile.am b/panels/common/Makefile.am
index 575fd03..3f691c6 100644
--- a/panels/common/Makefile.am
+++ b/panels/common/Makefile.am
@@ -10,7 +10,9 @@ AM_CPPFLAGS =                                         \
 
 BUILT_SOURCES =                        \
        cc-common-resources.c   \
-       cc-common-resources.h
+       cc-common-resources.h   \
+       gsd-common-enums.c      \
+       gsd-common-enums.h
 
 liblanguage_la_SOURCES =               \
        $(BUILT_SOURCES)                \