* use an indirect jmp in fpc_longjmp

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24877 3ad0048d-3df7-0310-abae-a5850022a9f2
* fpc_setjmp and fpc_longjmp updated to support far code memory models

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24878 3ad0048d-3df7-0310-abae-a5850022a9f2