Clarify that MAKEOBJDIRPREFIX and MAKEOBJDIR are not
honored as make(1) arguments.

Requested by:	smh
MFC After:	3 days
Sponsored by:	The FreeBSD Foundation
gcc: fix strict alignment.

From the OpenBSD log:

x86-64 ABI requires arrays greater than 16 bytes to be aligned to
16byte boundary.  However, GCC 16-byte aligns arrays of >=16 BITS,
not BYTES.

This diff improves bug detectability for code which has local arrays
of [16 .. 127] bits:  in those cases SSP will now detect even 1-byte
overflows.

Obtained from:	OpenBSD (CVS rev 1.4)
MFC after:	1 week