Testsuite: *do* replace backslashes in config.libdir
See `Note [Replacing backward slashes in config.libdir]` There is one caveat: in ae4acbd1 I mentioned: > Changing backwards slashes to forward slashes apparently confuses > msys2/mingw magic path handling. I can not reproduce that problem anymore, however. This patch validates for me, and fixes all tests that use config.libdir for WAY=ghci. We'll see how it goes.
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