[Bug libstdc++/61532] [4.9/4.10 regression] make_signed and make_unsigned wchar_t have started failing in the libstdc++ testsuite.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61532

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #4)
> Writing "signed wchar_t" doesn't seem legal to me, and clang and intel warn
> or reject such code.

Yeah, it's a GCC extension, and I thought I'd replaced the uses of it in the
tests with something portable, but apparently not!