Rename "syscall" to "_syscall" and provide "syscall" as a weak alias.

Put missing END() markers to set ELF symbol size.

Mark __cerror as hidden and exploit that to simplify assembler.

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

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

use canonical indirect jmp & call syntax to squelch new as(1) warning

Repair syscall stubs that were not updated when the cerror interface was
modified.

Amend for the PLT fixes, things broke last night with the changes to SYS.h
and cerror.S. In particular, the syscalls in the files committed below were
broken.

* On architectures using ELF, and conditionally on those in transition, rename
_ASM_LABEL(cerror) and _ASM_LABEL(curbrk) to _C_LABEL(__cerror) and
_C_LABEL(__curbrk) (or their respective architecture

* On architectures using ELF, and conditionally on those in transition, rename
_ASM_LABEL(cerror) and _ASM_LABEL(curbrk) to _C_LABEL(__cerror) and
_C_LABEL(__curbrk) (or their respective architecture-specific equivalents) to
avoid possible name clashes with identifiers used in user applications.
* Do the same for minbrk on all architectures to avoid a GCC-specific (and
on ELF architectures effectively useless) symbol reference renaming in MI code.

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RCSID fixes: Always use the NetBSD rcsid and the macro RCSID() defined in
<machine/asm.h>; Also syscalls should be protected using the SYSLIBC_SCCS
define not LIBC_SCCS

Use trap gate to enter kernel.

Random cleanup.

Use PIC_PLT for error returns.
Correct operand order in accessing `minbrk' and `curbrk'.

Move the old berkeley sccs id into the header comment like it is done
for other source files.

make an arch directory in libc, and move all machine dirs into it