bug#16842: [PATCH] Use mbrtowc_cache in DFA engine

[Paul Eggert]

Thanks for the review and the fixes.  I found a couple more things. 
First, it's not portable to cast wint_t * to wchar_t *, since the 
pointed-to types might be different sizes or representations. Second, we 
can put the cache directly in the struct dfa, saving the overhead of 
doing a separate malloc.

The attached further patch should address these problems.  I pushed 
this, along with the earlier two patches in this sequence, and am 
marking this as done.

0003-dfa-avoid-an-indirection-and-port-wint_t-usage.patch
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