Fixed word reversed fixup problem.

For some reason, there was code in several places that marked fixups/symbols
as belonging to a RISC section when it was clearly not the case. As a result,
it caused serious problems by reversing words in 68K sections just because a
symbol had been seen in a MOVEI # statement in a RISC section. Probably not
the last nasty surprise in this pile of spaghetti. :-/