Convert to C89 prototypes. Remove use of __P

KNF; no variable name in function prototype.

Change all the syscall C 'glue' functions (most of which just add in an
extra argument to ensure that 'off_t' parameters are even numbered
parameters for stack alignment reasons on 32 bit systems) to

Change all the syscall C 'glue' functions (most of which just add in an
extra argument to ensure that 'off_t' parameters are even numbered
parameters for stack alignment reasons on 32 bit systems) to use a normal
'syscall' wrapper for __foo instead of using __syscall(SYS_foo, ... ).
This saves all the faffing needed to get a 32bit return value on sparc.
Auto-generate the extra syscall wrappers.
Move swapon.c into the correct list (swapon() uses swapctl()).
This probably means there are very few users of syscall() and __syscall() left.

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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

delint

int -> ssize_t ... today is not my day.

Wrappers around the indirected positional i/o system calls; the off_t
arguments must be padded.