This test is specifically intended to disable Pen/Tablet support on
classic MinGW (32-bit) platforms that lack required symbol definitions
although Pen/Tablet support might be supported by the Windows system.
This test can be extended for other platforms, but for now it's
performed only on Windows.
This option can be used to disable pen/tablet support if there are
build problems on a particular platform or build system (e.g. MinGW)
so users can continue to build FLTK 1.5.
Users can also choose to disable pen support if they don't need it.
This removes the need to guess names of files each theme gives to cursor shapes
and makes linking with dbus superfluous when the compositor supports
the new protocol.
The old, surface-based approach to cursor shapes remains used for custom shapes.
Up to FLTK 1.4 we had two distinct input files for each header file:
one for configure and one for CMake. Since 1.5 we have only one input
file for each header which can now have a more appropriate name.
1) configh.cmake.in -> config.h.in
2) fl_config.cmake.in -> fl_config.h.in
