Now that spilling correctly works on m68k we definitely need to store/restore the registers inside the FpSyscall functions. Fixes quite some tests.

* rtl/linux/m68k/syscall.inc:
    Remove "assembler" modifier and instead use an inline asm block with an accurate list of modified registers so that the compiler correctly stores/restores them


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26804 3ad0048d-3df7-0310-abae-a5850022a9f2