Prepare for using liblzma in wxWidgets code by adding the necessary
option and updating the configure check for it (which had been already
present due to libtiff possible dependency on liblzma).
No real changes yet.
Don't overwrite options in setup.cmake.
Align text in summary message.
Always set wxUSE_XRC to values of wxUSE_XRC, same as in setup.h.
Disable wxUSE_XRC when expat is disabled.
Add CMake build system for libraries, tests and samples
update_files.py converts build/files into CMake format.
build/update-setup-h has been modified to update build/cmake/setup.h.in.