Backport #3404: Cannot build on VC++2010 Windows7
http://redmine.ruby-lang.org/issues/show/3404
e$B5/I<<Te(B: Shyouhei U.
e$B%9%F!<%?%9e(B: Assigned, e$BM%@hEYe(B: Normal
e$BC4Ev<Te(B: Shyouhei U., e$B%+%F%4%je(B: build
e$BHwK:!#e(BWindows2007e$B>e$Ne(BVisual C++ 2010 Express
Editione$B$G%3%s%Q%$%k$G$-$^$;$s!#e(B1.8.8deve$B$O%3%s%Q%$%k$G$-$k$i$7$$!#e(B
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