[cairo] win32 build

[Tor Lillqvist]

BTW, what might be the correct fix for these two problems in the Win32
backend in CVS as of currently:

cairo-win32-surface.c: In function `categorize_solid_dest_operator':
cairo-win32-surface.c:678: warning: control reaches end of non-void function
cairo-win32-surface.c: In function `_cairo_win32_surface_set_clip_region':
cairo-win32-surface.c:755: error: too few arguments to function `_cairo_surface_set_clip_region'

--tml