[gnome-software] trivial: Fix automake deprecation warning

[Richard Hughes <rhughes src gnome org>]

commit 2dbfb2c9f4725790a1e15b9ca07da7474edfdbf3
Author: Richard Hughes <richard hughsie com>
Date:   Sat May 18 19:12:01 2013 +0100

    trivial: Fix automake deprecation warning

 src/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index fd38e87..572491e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,7 +1,7 @@
 SUBDIRS =                                              \
        plugins
 
-INCLUDES =                                             \
+AM_CPPFLAGS =                                          \
        $(GLIB_CFLAGS)                                  \
        $(GTK_CFLAGS)                                   \
        $(PACKAGEKIT_CFLAGS)                            \