Debian bug #517535: we were unconditionally interpreting the

Debian bug #517535: we were unconditionally interpreting the
'string' field in a GdkEventKey structure as ISO-8859-1, which was
correct for GTK 1.2 but in 2.0 that field is encoded according to
the current C library locale. Hence, we now process that field by
converting it to UTF-8 via trips through both libc and libcharset,
and then let lpage_send() convert from UTF-8 back to whatever it's
supposed to actually go down the line in.

git-svn-id: svn://svn.tartarus.org/sgt/putty@8470 cda61777-01e9-0310-a592-d414129be87e