[tomboy] Update ax_require_config from upstream

[Alex Tereschenko <alexter src gnome org>]

commit bd3a14733caa0b87a3b64d7b4a28ea775a2b0d80
Author: Alex Tereschenko <frozen and blue gmail com>
Date:   Sat May 20 10:25:06 2017 +0200

    Update ax_require_config from upstream
    
    Signed-off-by: Alex Tereschenko <frozen and blue gmail com>

 m4/ax_require_defined.m4 |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/m4/ax_require_defined.m4 b/m4/ax_require_defined.m4
index cae1111..17c3eab 100644
--- a/m4/ax_require_defined.m4
+++ b/m4/ax_require_defined.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_require_defined.html
+#    https://www.gnu.org/software/autoconf-archive/ax_require_defined.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -30,7 +30,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 1
+#serial 2
 
 AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
   m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])