Belatedly adapt to changes in the code.
stmt;; -> stmt;
Fix newline problem which was added in previous commit.
acpi_md_findoverride is only used when NIOAPIC > 0, so don't provide it
otherwise.
Use macro.
buf is only used in the ioapic case.
Match lapic conditionals from the primary CPU.
Don't reserve space (128) on signal stack for unknown reasons; the actual
space for struct sigframe_siginfo (+ alignment) is allocated just below.

Confirmed by the following tests:

	tests/lib/libc/gen/t_siginfo
	tests/lib/libc/sys/t_sigtimedwait
	tests/lib/libc/sys/t_sigaction
	tests/lib/libc/sys/t_sigqueue
CID 745290: check return of fcntl
CID 745319: Checking the wrong variable for NULL.
CID 745439: Fix memory leak
CID 745411: Fix memory leak
CID 975238: Unchecked returns
CID 978337: Fix resource leak
CID 1011266: Unchecked returns
restore defaulting to the 'a' partition for booting with root on raid as
it was before, and explain why we do things this way.
revert previous; the 128 bytes is for the AMD64 redzone
kill extra )