[m4-common] Add A[CX]_CHECK_DEFINE

[Emmanuele Bassi <ebassi src gnome org>]

commit 9baee6cade189aeb4f2d3374be9a6d98a3925ecc
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Apr 20 21:53:09 2019 +0100

    Add A[CX]_CHECK_DEFINE
    
    The gnome-keyring module started depending on this macro.

 Makefile.am | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/Makefile.am b/Makefile.am
index 9af3869..90b83e0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,6 +6,7 @@ dist_aclocal_DATA = \
        autoconf-archive/m4/ax_append_link_flags.m4                     \
        autoconf-archive/m4/ax_append_flag.m4                           \
        autoconf-archive/m4/ax_check_compile_flag.m4                    \
+       autoconf-archive/m4/ax_check_define.m4                          \
        autoconf-archive/m4/ax_check_enable_debug.m4                    \
        autoconf-archive/m4/ax_check_girs_gjs.m4                        \
        autoconf-archive/m4/ax_check_gir_symbols_gjs.m4                 \