[PATCH] Make the pointer parameter to __gthread_setspecific non-const

[Aaron W. LaFramboise]

Richard Guenther wrote:
> On Sat, Aug 23, 2008 at 10:58 PM, Aaron W. LaFramboise
> <aaronavay62@aaronwl.com> wrote:

>> If you do a clean bootstrap of i386-pc-mingw32 from svn or a snapshot, it
>> will fail in stage2 in a file that includes gthr-win32.h.
> 
> Ok.  I'd rather use the union trick then in gthr-win32.h.

Alright.  In that case, is the attached patch OK?

As I mentioned, neither <system.h> nor <tsystem.h> are available here 
because other top-level libraries that don't have those use this, so we 
have to redefine this macro.

I tested this on i386-pc-mingw32 with a bootstrap.
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