Requiring C11 breaks build with GCC 4.6.2 on Windows XP

[martin rudalics]

This change

    Explicitly require C11 or C++11 in emacs-module.h

apparently breaks building here on Windows XP with GCC 4.6.2 as

  CC       dispnew.o
In file included from ../../src/lisp.h:3899:0,
                 from ../../src/dispnew.c:27:
../../src/emacs-module.h:25:3: error: #error "This file requires at least C11 or 
C++11"
make[1]: *** [dispnew.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[2]: Entering directory `/c/emacs-git/trunk/opt/admin/charsets'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/c/emacs-git/trunk/opt/admin/charsets'
make[1]: Leaving directory `/c/emacs-git/trunk/opt/src'
make: *** [src] Error 2

martin