[network-manager-applet] build: fix compilation of gnome-bluetooth

[Jiří Klimeš <jklimes src gnome org>]

commit 27eb3fda8afd7c1f18771dacf352747773a58a75
Author: Jiří Klimeš <jklimes redhat com>
Date:   Thu Nov 27 10:51:50 2014 +0100

    build: fix compilation of gnome-bluetooth
    
    Broken by 1bb881d486ebb5500961345a104d7a400074b8e2.

 src/gnome-bluetooth/Makefile.am |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-bluetooth/Makefile.am b/src/gnome-bluetooth/Makefile.am
index 35d67ef..940aeba 100644
--- a/src/gnome-bluetooth/Makefile.am
+++ b/src/gnome-bluetooth/Makefile.am
@@ -22,8 +22,10 @@ plugin_LTLIBRARIES = libnma.la
 
 libnma_la_SOURCES = $(BT_WIDGET_SOURCES)
 
+libnma_la_CPPFLAGS = $(AM_CPPFLAGS)
+
 if WITH_MODEM_MANAGER_1
-libnma_la_CPPFLAGS = $(AM_CPPFLAGS) $(MM_GLIB_CFLAGS)
+libnma_la_CPPFLAGS += $(MM_GLIB_CFLAGS)
 endif
 
 libnma_la_LDFLAGS = -module -avoid-version