Request for swapcontext and getcontext to be ported to our libc

[Matt Emmerton]

The first cut of this work has been completed.  I've ported over the FreeBSD
i386 work, which is a hybrid libc + kernel syscall implementation.

You can find the source changes and a tiny test program here:
http://www.gsicomp.on.ca/~matt/dfly/

I hope to have a libc-only implementation completed before the end of the
week.

--
Matt Emmerton