Detect wcwidth bug on OpenBSD 4.0.

[pspp] / ChangeLog

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+2008-01-08  Bruno Haible  <bruno@clisp.org>
+
+       * m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Test also U+3000. Needed to
+       detect bug on OpenBSD 4.0.
+       * doc/functions/wcwidth.texi: Document the OpenBSD bug.
+
 2008-01-08  Eric Blake  <ebb9@byu.net>
 
        Rewrite memmem to guarantee linear complexity without malloc.