[NetworkManager-pptp/lr/gtk-4.0] build: specify maximum glib version

[Lubomir Rintel <lkundrak src gnome org>]

commit 30b25f5b9afdbcdd5094c33e6ade7fc7d89fe6cb
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Thu Nov 4 13:31:16 2021 +0100

    build: specify maximum glib version
    
    ...so that we don't accidentally use newer API.

 configure.ac | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/configure.ac b/configure.ac
index b33f251..4a40f1f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -112,6 +112,7 @@ AM_GLIB_GNU_GETTEXT
 # gio-unix will require glib and gio
 PKG_CHECK_MODULES(GLIB, gio-unix-2.0 >= 2.32)
 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)