Linux-specific.
Include <sys/uc_access.h> if available.
(NELEMS): Delete (already defined in internal.h).
(all_funcs): Remove left-over #if 1 directives.
(sighandler): Add HP-UX support.
(enable_sighandler): Replace SA_NOMASK with SA_NODEFER. The former
is not available on HP-UX.
(disable_sighandler): Likewise.
(Logical change 1.221)
(save_static_to_fr): Rename from save_static_to_fpreg().
(check_static_to_fr): Rename from check_static_to_fpreg().
(save_static_to_br): Declare.
(check_static_to_br): New function.
(save_static_to_mem): Declare.
(check_static_to_mem): New function.
(all_funcs): Mention new save/checks.
(Logical change 1.175)