[Bug 599567] mingw32-gcc should not drag in pthreads.h because it's buggy

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https://bugzilla.redhat.com/show_bug.cgi?id=599567

Bug 599567 depends on bug 641423, which changed state.

Bug 641423 Summary: mingw32-gcc installs files both inside and outside the sysroot
https://bugzilla.redhat.com/show_bug.cgi?id=641423

What    |Old Value                   |New Value
----------------------------------------------------------------------------
         Resolution|                            |WONTFIX
             Status|NEW                         |CLOSED
         Resolution|WONTFIX                     |
             Status|CLOSED                      |ASSIGNED