Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Bring in a version of float.h more correct for softfloat.

Start all license statements with /*-

Forced commit to note that the previous commit message doesn't apply
to the ARM port. We set FLT_ROUNDS to -1 (indeterminate), because the
rounding mode on ARM is static, i.e. part of the FP instruction
format. Or at least that's my understanding.

Make FLT_ROUNDS correctly reflect the dynamic rounding mode.

Import FreeBSD/arm kernel bits.
It only supports sa1110 (on simics) right now, but xscale support should come
soon.
Some of the initial work has been provided by :
Stephane Potvin <sepotvin at videotron.ca>
Most of this comes from NetBSD.