liblfds compiled on mips64, ppc64 and sparc64

Thanks to the GCC Compile Farm, liblfds now has been built on mips64, ppc64 and sparc64!

Nicely, only ppc64 needed work – the defines in the porting layer header for the processor were wrong.

I can’t run the test programme on these platforms though – the test code runs at 100% on all CPUs for some time and would hammer the other users.