Rbconfig / libpathflag is wrong

Just got the latest stable ruby_1_8. On mingw32 I can't link an
extension with

CONFIG["LIBPATHFLAG"] = " -L'%s'"

It must be

CONFIG["LIBPATHFLAG"] = " -L%s"

or

CONFIG["LIBPATHFLAG"] = %{ -L"%s"}

···

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