[glibmm] configure.ac: Use MM_AX_CXX_COMPILE_STDCXX_11 from mm-common.

[Murray Cumming <murrayc src gnome org>]

commit 84510ee07d9485c977a71f28b4bb3e33904aad25
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Jul 14 08:48:14 2015 +0200

    configure.ac: Use MM_AX_CXX_COMPILE_STDCXX_11 from mm-common.
    
    Instead of AX_CXX_COMPILE_STDCXX_11().
    See bug #751432

 build/ax_cxx_compile_stdcxx_11.m4 |  168 -------------------------------------
 configure.ac                      |    2 +-
 2 files changed, 1 insertions(+), 169 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f690a52..3ddef78 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ MM_CONFIG_DOCTOOL_DIR([docs])
 AC_SUBST([LIBGLIBMM_SO_VERSION], [4:0:3])
 
 AC_PROG_CXX
-AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
+MM_AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
 
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])