[patch] Allow Filesystem TS to compile without wchar_t

[Jonathan Wakely]

This guards all uses of wchar_t with _GLIBCXX_USE_WCHAR_T.

There's also a second patch that improves a testsuite helper function
slightly.

Tested powerpc64le-linux, x86_64dragonfly, powerpc-aix. Committed to
trunk.


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