sparc: fix build for linuxthreads.old
sparc target has assembly implementations of clone.S that doesn't
get used, and thus the build breaks. Also, sparc is missing a header file in
pthreads.old that exists in pthreads.new.
Signed-off-by: Rob Landley <rob@landley.net>
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>