c2hs rejects mingw32's stdlib.h

[facundominguez]

Haskell-platform 2013.2.0.0 Windows i386. Current HEAD of master of c2hs.
The following error occurs with current HEAD of master but not with 0.16.5.

$ cat Test.chs
module Test where
#include <sdtlib.h>

$ c2hs Test.chs
c2hs.exe: C header contains errors:

c:\\program files (x86)\\haskell platform\\2013.2.0.0\\mingw\\bin\\../lib/gcc/mingw32/4.5.2/../../../../include/stdlib.h:436: (column 10) [ERROR]  >>> Syntax error !
  The symbol `_atoi64' does not fit here.

The offending lines in stdlib.h are

#ifdef __MSVCRT__
_CRTIMP __int64 __cdecl __MINGW_NOTHROW _atoi64(const char *);

[ian-ross]

The problem with this was the fix I'd made for issue #51. There's now a command-line flag to enable the behaviour required for issue #51, and the default behaviour should work for this issue.