let the assembler decide about the size of the Bcc and BRA instructions, this makes code generated here work on a 68000 (and probably a lot smaller in size, no more forced 32bit displacements)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27084 3ad0048d-3df7-0310-abae-a5850022a9f2