Variant wcwidth results on Solaris

[Gavin Smith]

I wondered if there has been any change since this report:

https://lists.gnu.org/archive/html/bug-gnulib/2008-08/msg00209.html

The issue is that on Solaris 10 and Solaris 11, wcwidth returns 2 
instead of 1 for some characters, for example, opening double quote “.

Some of these characters are listed as "ambiguous" under 
http://unicode.org/reports/tr11-2/, but having different results on 
different systems makes a test suite almost useless on at least one of 
the systems.

Would it be possible for gnulib to override the system wcwidth if it has
unusual return values?

wcwidth is used by the texi2any program in Texinfo to output to 
monospaced plain text for use in a terminal emulator.  It is used for 
wrapping lines.