Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Save and restore non-volatile floating-point registers during longjmp().
This should also save and restore non-volatile Altivec registers, but that
needs to wait on solving two problems:
1. Adding the nonvolatile vector registers means we need 5 more than _JBLEN
entries in jmp_buf on 32-bit targets (64-bit is OK).
2. Need to figure out how to determine if saving/restoring vector regs
is supported on the current CPU from userland.

MFC after: 1 month

Ensure that every ENTRY(foo) has a matching END(foo).
It allows to build with newer binutils

Differential Revision: https://reviews.freebsd.org/D877
Reviewed by: jhibbits

Do not restore the register holding the TLS pointer when doing various
usermode context switches (long jumps and ucontext operations). If these
are used across threads, multiple threads can end up with the same TLS base.
Madness will then result.

This makes behavior on PPC match that on x86 systems and on Linux.

MFC after: 10 days

Mark assembler sources from libc as working with non-executable stack.

Reviewed and tested by: nwhitehorn

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Provide 64-bit PowerPC support in libc.

Obtained from: projects/ppc64