mbstate_t not properly detected

[Denis Corbin]

Hi,

On several system (Solaris 2.6, openBSD 3.6, macOS X 10.2), the
mbstate_t structure is not detected by autoconf while system include 
files provide it. Autoconf does thus redefine this type which conflicts 
with real system headers, leading to compilation problem while parsing 
system headers.

The workaround on theses systems is to manually change the generated
config.h by adding:

    #define HAVE_MBSTATE_T 1

and commenting out:

    /* #define mbstate_t int */

I have not seen any bug report about that problem, maybe I have missed
something somewhere?

Cheers,
Denis Corbin.