1) It wouldn't build at all for me, because source/fat had been missed off the
INCLUDES line.
2) Stray whitespace removed (to stop emacs warning on saving)
3) DS_BUILD flag selection reworked slightly. Now do: make all SCUMM_BUILD=x
(where x is a,b,c,d,e,f,g) and it'll select that version and build it. If
no x is supplied or x is not a-g, then version a will be built.
4) New allbuilds target. In backends/platform/ds, do: make allbuilds
and versions A-G are built in turn (version G does not complete currently due
to lack of logo g). This uses a 'semiclean' target in each makefile to clean
just the files that change between versions.
svn-id: r32470
