cherry-pick CONST_CAST from gcc-in-cxx tree

Wed May 27 18:15:00 GMT 2009

This cast fix allows a c++ plugin to include gimple.h.

gcc/Changelog
2009-05-27  Tom Tromey  <tromey@redhat.com>

    * system.h (CONST_CAST): Use C++ const_cast when compiled as C++

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