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This patch fixes a miscompilation of mmap() for Coldfire with gcc 4.x.
The problem was that the syscall was being invoked before any part of
the argument structure (buffer[]) had been initialised.
The outcome of gcc PR 19341 is that volatile asms don't implicitly
use or clobber memory, and that "memory" must be explicitly listed
in the clobber list:
http://gcc.gnu.org/PR19341
All syscalls can potentially use or clobber memory, so this patch
adds a "memory" clobber to all the m68k syscall wrappers that I
could find.
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