Include mingw32 in checking for a windows ruby platform. http://github.com/tra/spawn/issues/issue/14
Include mingw32 in checking for a windows ruby platform. http://github.com/tra/spawn/issues/issue/14

git-svn-id: f67d969b640da65cb7bc1d229e09fd6d2db44ae1@825 392d7b7b-3f31-0410-9dc3-c95a9635ea79

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