bug#23358: merging byte to wide char caches in gawk

[Aharon Robbins]

Hi.

Here is my proposed patch for merging the byte to w.c. caches in gawk
by using the one in dfa.

I renamed the one in dfa to 'btowc_cache' since it caches bytes,
not multibyte characters.   This compiles and gets through the test
suite.

I also changed the check for the return of mbrtowc since it returns
unsigned.

Thanks,

Arnold

dfa.diff
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