Adapt SYS.h to use retguard macros from asm.h, so that generated system
calls are guarded. Adapt the first few hand-written functions to this
model (a few remain)
ok kettenis mortimer

PowerPC64 libc string/net files

Initial attempt to port powerpc code to powerpc64

Expects TOC loading in ENTRY(),

memmove.S is the powerpc 32 bit, optimization is possible for 64 bit
and handle le

PowerPC64 libc string/net files

Initial attempt to port powerpc code to powerpc64

Expects TOC loading in ENTRY(),

memmove.S is the powerpc 32 bit, optimization is possible for 64 bit
and handle len of > 32 bits.

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