'RELENG_3_5_0_RELEASE'.

This commit was manufactured to restore the state of the 3.5-RELEASE image.
Releases prior to 5.3-RELEASE are omitting the secure/ and crypto/ subdirs.

scvidctl.c 1.18, and scmouse.c 1.10, 1.11).

Submitted by: jmg

(This fix is slightly different from his original patch, but has
the same effect.)

Approved by: jkh

the graphics mode (rev 1.11).

- Don't assume the line length in the video memory is always the same as
  the screen width.
- Store the current video mode information in the `video_adapter' struct.
- The size of the `v_offscreensize' field in the VESA mode information
  block is u_int16, not u_int8.

Oked by: jkh

- Bring down the splash screen when a vty is opened for the first
  time.
- Make sure the splash screen/screen saver is stopped before
  switching vtys.
- Read and save initial values in the BIOS data area early.
  VESA BIOS may change BIOS data values when switching modes.
- Fix missing '&' operator.
- Move ISA specific part of driver initialization to syscons_isa.c.

atkbd
- kbdtables.h is now in /sys/dev/kbd.

all
- Adjust for forthcoming alpha port.  Submitted by: dfr

keyboard and video card drivers.

Because of the changes, you are required to update your kernel
configuration file now!

The files in sys/dev/syscons are still i386-specific (but less so than
before), and won't compile for alpha and PC98 yet.

syscons still directly accesses the video card registers here and
there; this will be rectified in the later stages.

- Express various sizes in bytes, rather than Kbytes, in the video
  mode and adapter information structures.
- Fill 0 in the linear buffer size field if the linear frame buffer
  is not available.
- Remove SW_VESA_USER ioctl. It is still experimetal and was not meant
  to be released.
- Fix missing cast operator.
- Correctly handle pointers returned by the VESA BIOS. The pointers
  may point to the area either in the BIOS ROM or in the buffer supplied
  by the caller.
- Set the destructive cursor at the right moment.