[dconf] service/Makefile.am: fix code generation

[Ryan Lortie <ryanl src gnome org>]

commit 19bca1d807d47b7b28f1343aa7ed980ddc6cbe96
Author: Ryan Lortie <desrt desrt ca>
Date:   Mon Oct 29 14:53:28 2012 +0100

    service/Makefile.am: fix code generation
    
    This ensures that we don't do the gdbus-codegen twice when running in
    make -j.

 service/Makefile.am |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/service/Makefile.am b/service/Makefile.am
index c2dd6f7..3f70ff2 100644
--- a/service/Makefile.am
+++ b/service/Makefile.am
@@ -21,7 +21,9 @@ dconf_service_SOURCES = \
 	dconf-writer.c			\
 	main.c
 
-dconf-generated.h dconf-generated.c: ca.desrt.dconf.xml Makefile
+dconf-generated.c: dconf-generated.h
+
+dconf-generated.h: ca.desrt.dconf.xml Makefile
 	gdbus-codegen --generate-c-code dconf-generated --c-namespace DConfDBus --interface-prefix=ca.desrt.dconf. $(srcdir)/ca.desrt.dconf.xml
 
 DISTCLEANFILES = ca.desrt.dconf.service