[klibc] Move #include <asm/signal.h> into <klibc/archsignal.h>

Some platforms, notably i386, have <asm/signal.h> which has old
compatibility stuff in it (in the case of i386, it has the libc5
definitions.)  Move the include of <asm/signal.h> into
<klibc/archsignal.h> so it can be removed if appropriate to a
specific platform.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
19 files changed