Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.13.4;
Pass PICFLAGS down to cc-as-as and use __PIC__ to decide if it is small
vs big PIC mode. Retire -DPIC and -DBIGPIC.

branches: 1.12.6; 1.12.12;
Switch to the PIC_GOTSETUP/PIC_TOCSETUP macros for PIC code. Now libc
will be built to use secureplt by default.

Use END(foo) everywhere.
Make __cerror hidden.
Use non-PLT calls to __cerror.
Use assym.h when appropriate.
Use addi to adjust stack instead of loading it.
Add __RCSIDs
Force -D_NOREGNAMES for all .S files.
[this is all in preperation for secure plt support]

Convert to use register prefixes. (0 -> %r0, etc.)

branches: 1.9.2; 1.9.4;
Thinko in previous: we do always use an internal name.

Add internal names for brk() and sbrk().

branches: 1.7.4;
Missed in end -> _end cleanup.

Change references to `end' to `_end' as not to invade (or being invaded by)
the user's name space.

* 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.

Add PIC version.

Use asm.h defines for symbols

Remove long obsolete copyright (should have been done before initial import)

Architecture-specific bits for libc on the PowerPC. From Wolfgang
Solfrank <ws@tools.de>