[COMMITTED PATCH] Use pragmas rather than makefiles for necessary options for unwind code.

[Roland McGrath]

OK.  I've reverted it (including the ChangeLog and all, since there were no
later commits anyway).

I was eager to do this because I thought it was going to simplify some
other changes I'm working on.  But I changed tack on that work anyway
so I think this is now wholly orthogonal.


Thanks,
Roland