Detect buggy mbrtowc(3) implementations and skip tests

[Assaf Gordon]

Hello,

Continuing from previous threads, the attached draft patch creates a new C 
program to test mbrtowc(3) behavior,
and adds test infrastructure to skip tests if needed.

Comments welcomed,
 - assaf

P.S.
The tests will be skipped and not fail, but this doesn't yet mean sed is 
operating correctly on these systems. Perhaps a more long-term solution is to 
detect bugs during configure and add gnulib's mbrtowc replacement.

0001-tests-skip-tests-upon-buggy-mbrtowc-implementations.patch
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