m68k: Verify the offsets in struct siginfo never change.

A change to the generic struct siginfo accidentally changed the offset
of si_offset.  Add build time checks to ensure the offsets of all known
fields in struct siginfo never change.  This copies the form of similar
changes on x86.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
1 file changed