Add a separate script to build the memstick.img and the
mini-memstick.img with UEFI support.

As the comments in the file suggest, 1) there must
be existing ${.OBJDIR}/usr/src/release/{release,bootonly};
2) TARGET/TARGET_ARCH must be amd64; and 3) it must be
a vt(4)-enabled kernel with vt_efifb (*not* vt_vga).

This script is not hooked into release/Makefile in any way
until further testing is complete.

Sponsored by:	The FreeBSD Foundation
Add a UEFI kernel configuration to include the VT kernel, and
replace the vt_vga driver with vt_efifb.

This is intended to help with snapshot builds only.

There is no intention to MFC this commit.

Sponsored by:	The FreeBSD Foundation
Define startup order the same way as it is in dummynet.
r261913 broke DES passwords, because the only way they could work,
since they don't have an easily recognizable signature, was if they
were the default.  This commit rewrites crypt_set_format(3) etc to
address this:

 - Use a pointer instead of an index to identify the default format.
   This pointer is initialized at compile time to point to the first
   first element in the list of supported formats, eliminating the
   need for crypt_setdefault().  Using a pointer also simplifies
   iterating through the list.

 - Associate DES with the magic string "_", which takes care of the
   Extended DES format.

 - Finally, as a special case, if the salt does not match any known
   magic string but matches ^[./0-9A-Za-z]{13}$, it is assumed to be a
   DES password and is passed on to crypt_des().

MFC after:	1 week
Note that the bug was fixed, and when.
Add sysctl OIDs showing the actual size and capacity of the swap zone.

MFC after:	1 week
date(1): Add "-R" flag to use RFC 2822 date and time output format

As stated in the man page, this is equivalent to use "%a, %d %b %Y %T %z"
as the output format while LC_TIME is set to the "C" locale.

This is compatible with date(1) from the GNU core utilities.
Correctly set the sysctl format to Alphanumeric, rather than letting it default.

Approved by: security-officer(des)
date(1): Forgot to update manpage date in r264968

MFC after:	1 week
MFC with:	264968
Initialize rssi variable.
Unify sa_equal() macro usage.

MFC after:	2 weeks
Remove sa_equal() definition since it is already defined in net/route.h.

Noted by:	ian
MFC after:	2 weeks
Add generation of an EFI filesystem to hold boot1.efi. This is a near-exact
copy of the code from boot1.chrp again.

The resulting image is installed to /boot/boot1.efifat. If dd'ed to an 800K
"efi" partition, it should result in a bootable system.
Use "hash" value in rtalloc_mpath_fib() instead of RTF_ANNOUNCE flag.
Hashing method is the same as in in6_src.c. (Probably we need better one).

MFC after:	2 weeks
Stop calling imx51_ccm_foo() clock functions from imx6 code.  Instead
define a few imx_ccm_foo() functions that are implemented by the imx51 or
imx6 ccm code.  Of course, the imx6 ccm code is still more a wish than
reality, so for now its implementations just return hard-coded numbers.
Add EFI support to the installer. This requires that the kernel provide
a sysctl to determine what firmware is in use. This sysctl does not exist
yet, so the following blocks are in front of the wheels:
- I've provisionally called this "hw.platform" after the equivalent thing
  on PPC
- The logic to check the sysctl is short-circuited to always choose BIOS.
  There's a comment in the top of the file about how to turn this off.

If IA64 acquired a boot1.efifat-like thing (probably with very few
modifications), the same code could be adapted there.
make_dtb.sh is designed to be used in a kernel build environment where
MACHINE is defined to the target's value, not the host's
value. However, in Makefile.inc1, it is still defined to be the host's
value. Make the makedtb target work by expanding TARGET in the
existance test, and passing MACHINE=$TARGET in the call to make_dtb.sh
Apparently this is supposed to be FAT32, not FAT12.
The freescale imx uart driver works for the whole i.MX family, so rename the
header file to not have "5xx" in the name.
Fix gcc build, initialize off variable.