[glibmm] glib/glibmmconfig.h: Allow Build on Visual Studio 2013

[Chun-wei Fan <fanchunwei src gnome org>]

commit 4e7bc1af8a18152ef7696f1fdc6914c14ec6f6f4
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Sep 2 16:16:26 2015 +0800

    glib/glibmmconfig.h: Allow Build on Visual Studio 2013
    
    Visual Studio 2013 supports enough of C++-11 to support the build of
    glibmm, except that it does not support noexcept (which is something
    that Visual Studio 2015 supports).  Define noexcept as _NOEXCEPT on
    Visual Studio 2013, so that one can build glibmm on it.
    
    Note that since later Visual Studio versions do not allow one to
    define known keywords like noexcet as macros, we need to define
    _ALLOW_KEYWORD_MACROS to workaround this limitation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753271

 glib/glibmmconfig.h.in |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/glib/glibmmconfig.h.in b/glib/glibmmconfig.h.in
index 65304cc..241aea3 100644
--- a/glib/glibmmconfig.h.in
+++ b/glib/glibmmconfig.h.in
@@ -112,6 +112,11 @@
 # define GLIBMM_EXCEPTIONS_ENABLED 1
 # define GLIBMM_DEFAULT_SIGNAL_HANDLERS_ENABLED 1
 # pragma warning (disable: 4786 4355 4800 4181)
+
+#if (_MSC_VER < 1900) && !defined (noexcept)
+#define _ALLOW_KEYWORD_MACROS 1
+#define noexcept _NOEXCEPT
+#endif
 #endif
 
 /* Dummy macro definition for compatibility with old code that expects