[J-core] Original Linux fdpic support patch.

[Rob Landley]

FYI, https://github.com/mpe/linux-fullhistory/commit/077d38671fd8 is interesting
reading. That's the original patch adding fdpic support to the Linux kernel (for
the old FRV architecture).

I tracked back to that while trying to figure out why the personality() syscall
has PER_LINUX_FDPIC (which is a synonym for FDPIC_FUNCPTRS, which affects signal
delivery)...

Rob