tip is no longer .20 compatible

Some fixes

This is the way I like it: - Only call fpc on hwengine.pas, let compiler rule the dependencies - Make hwengine.pas depend on all other source files, so 'make' always calls fpc

Not a thing which is needed in release tarball

allow SDL 1.2 to at least do a 32767 map. We probably should add a TryDo somewhere to assert that limit on SDL 1.2 to avoid overflows. Ditto int version for SDL 2

allow SDL 1.2 to at least do a 32767 map. We probably should add a TryDo somewhere to assert that limit on SDL 1.2 to avoid overflows. Ditto int version for SDL 2

Added tag 0.9.20-release for changeset af0520a6bf00

remove one spurious WARNING tag from cmake message