The following patches add TLS support for hppa-linux.

The specification draft for TLS support for hppa-linux is located here:
http://parisc-linux.org/documentation/tls/hppa-tls-implementation.pdf

GCC patches for TLS support are already in place.

GLIBC support is setup except for the final addition of the relocs
to elf/elf.h. Patch has been sent to libc-alpha.

Passes without regressions on hppa-linux.
More specific tests still need to be written.

Ok to commit?

Cheers,
Carlos.