* include/pa-signal.h: Do not include ucontext.h.
	(SIGNAL_HANDLER): Add __attribute__ ((unused)) to signal handler
	arguments.
	(MAKE_THROW_FRAME): Do not adjust program counter.
	* include/hppa-signal.h: Do not include sys/types.h, sys/syscall.h and
	unistd.h.
	(MAKE_THROW_FRAME): Do not adjust program counter.
	(HANDLE_FPE): Define.
	(INIT_SEGV, INIT_FPE): Revise indentation.

From-SVN: r155116