[network-manager-pptp] properties: link to libnm-glib properly

[Lubomir Rintel <lkundrak src gnome org>]

commit e22b4fb64113254f2d71d2aef1b281e3f2c7b709
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Fri Mar 11 19:04:04 2016 +0100

    properties: link to libnm-glib properly
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762938

 properties/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/properties/Makefile.am b/properties/Makefile.am
index ae8e3ad..fe12078 100644
--- a/properties/Makefile.am
+++ b/properties/Makefile.am
@@ -46,8 +46,8 @@ libnm_vpn_plugin_pptp_la_LIBADD =                       \
 
 libnm_pptp_properties_la_LIBADD =                       \
         $(GTK_LIBS)                                     \
-        $(NM_LIBS)                                      \
-        $(NMGTK_LIBS)
+        $(LIBNM_GLIB_LIBS)                              \
+        $(LIBNM_GTK_LIBS)
 
 libnm_vpn_plugin_pptp_la_LDFLAGS =                      \
         -avoid-version