* README.win32
* config.h.win32: Add HAVE_WINTAB. Undefine it if bulding without
the Wintab SDK.
* gdk/win32/gdkinput.c: Hack some more. Still doesn't quite work
OK, but getting closer. Guard against bogus tilt data from Wacom
ArtPad II with the 3.40 driver. Add ifdefs for HAVE_WINTAB to
enable easier building without Wintab.
* gdk/win32/gdkinput.h
* gdk/win32/gdkevents.c
* gdk/win32/gdkwindow.c: Minor changes related related to above.
* gdk/win32/gdkvisual.c: Simplify a lot, remove leftovers from X11
code. As we have just one visual on Win32, no sense to have it in a
table, and no need for the hash table.
