Patch: Add -lmingwex to LIBGCC_SPEC for mingw32

[Mohan Embar]

Christopher,

>>ChangeLog
>>2003-04-15  Mohan Embar  <gnustuff@thisiscool.com>
>>
>>	* config/i386/mingw32.h: added mingwex to LIBGCC_SPEC
>
>-lmingwex was added to this file on 2003/02/15.

This was added to the head only and not 3.3. Is there any reason
this can't go into 3.3 also?

-- Mohan
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