[NetworkManager-fortisslvpn] build: limit GLib & GTK versions properly

[Lubomir Rintel <lkundrak src gnome org>]

commit e538f2f28df383373e9ecd396d98ddb2a9b86ea6
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Wed Mar 20 16:53:58 2019 +0100

    build: limit GLib & GTK versions properly

 configure.ac | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/configure.ac b/configure.ac
index e89648e..f21588f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -106,10 +106,12 @@ PKG_CHECK_MODULES(GLIB, gio-unix-2.0 >= 2.32)
 AC_SUBST(GLIB_CFLAGS)
 AC_SUBST(GLIB_LIBS)
 GLIB_CFLAGS="$GLIB_CFLAGS -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32"
+GLIB_CFLAGS="$GLIB_CFLAGS -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32"
 
 if test x"$with_gnome" != xno; then
        PKG_CHECK_MODULES(GTK, gtk+-3.0 >= 3.4)
        GTK_CFLAGS="$GTK_CFLAGS -DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_3_4"
+       GTK_CFLAGS="$GTK_CFLAGS -DGDK_VERSION_MAX_ALLOWED=GDK_VERSION_3_4"
 
        PKG_CHECK_MODULES(LIBNMA, libnma >= 1.2.0)
        PKG_CHECK_MODULES(LIBSECRET, libsecret-1 >= 0.18, [], [