When handling a single character (text length == 1), don't handle it as if

When handling a single character (text length == 1), don't handle it as if

1999-12-18  Tor Lillqvist  <tml@iki.fi>

* gdk/win32/gdkfont-win32.c (gdk_text_size, gdk_text_extents):
When handling a single character (text length == 1), don't handle
it as if it was UTF-8.