fix ancient issue with hedgehogs sliding through/into think gaps; fixes
issue #542; could and should be optimized (also to make sure that hogs can't slide through little pixel turds) - feel free to do so =P
As a special exception, FreeType can also be built with the 'makepp'
build tool, available from http://makepp.sourceforge.net.
Note, however. that you will need at least version 1.19 and pass the
option --norc-substitution to have it work correctly.