Missing mbstate_t.m4 file in regex module

[Ton Voon]

Hi!

Thanks for a great library and really simple import tools.

We've found that the regex module is missing the mbstate_t.m4 file,  
because it causes this compile error on HP-UX:

cc: "regex_internal.h", line 375: error 1000: Unexpected symbol:  
"mbstate_t".

This addition into modules/regex appears to be sufficient:

Files:
m4/mbstate_t.m4

configure.ac:
AC_TYPE_MBSTATE_T

Ton

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