[gtkmm] Use MM_AX_CXX_COMPILE_STDCXX() instead of MM_AX_CXX_COMPILE_STDCXX_11().

[Murray Cumming <murrayc src gnome org>]

commit e53415104b871ba5d973ee44e9bf313cc16b88da
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Feb 6 21:48:52 2016 +0100

    Use MM_AX_CXX_COMPILE_STDCXX() instead of MM_AX_CXX_COMPILE_STDCXX_11().
    
    This makes it easier to try C++14 sometimes and eventually really switch
    to it.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bd57dc3..e3c0f0f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
 AM_MAINTAINER_MODE
 AC_ARG_VAR([ACLOCAL_FLAGS], [aclocal flags, e.g. -I <macro dir>])
 
-MM_PREREQ([0.9.8])
+MM_PREREQ([0.9.10])
 MM_INIT_MODULE([gdkmm-3.0])
 MM_INIT_MODULE([gtkmm-3.0])
 
@@ -43,7 +43,7 @@ MM_CONFIG_DOCTOOL_DIR([docs])
 AC_SUBST([LIBGTKMM_SO_VERSION], [2:0:1])
 
 AC_PROG_CXX
-MM_AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
+MM_AX_CXX_COMPILE_STDCXX([11], [noext],[mandatory])
 
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])