Add various headers which are now installed:
./usr/include/dev/ic/bt431reg.h
./usr/include/dev/ic/bt459reg.h
./usr/include/dev/ic/bt463reg.h
./usr/include/dev/ic/ims332reg.h
EGCS fixes.
EGCS fixes + TU81 fix.
EGCS fixes.
minor performance improvement.
Make sure the interpreter string is long enough to check against.
Add definitions for the ATA power management commands
Increase compiled-in default bpf buffer size from 4096 to 8192.
(the libpcap API provides no way to resize the inkernel buffe,r and
4096 is too small to capture maximum-sized FDDI frames.)
Fix problem when using non-DEC CDROMS with blocksize other than 512 bytes.
This got lost when disk geometry processing was updated.

Also move the CDROM check from rzread() to rzwrite() - it doesn't make
much sense to report a read-only filesystem error when trying to read a
CDROM.
Cursor position offsets need different values for an sfb board with an
alternate clock that does lower resolution.
C++ support changes:

Generate .ctors and .dtors sections which contain the contructor and
deconstructor function addresses.

Use .init and .fini sections to call the functions to call those functions.

Include the crtbegin and crtend object files which perform those calls.
add a prototype for getpgid (missing for years!)
Allow changing of formerly empty passwords.
char -> unsigned char
char -> unsigned char
s/LALIGN/BTLALIGN
port to svr4.
qsort cast.
complete prototype for fts_compar.
- synchronize with the domestic version
- setupterm -> setup_term
- char -> unsigned char