Nuke the machinery to sync libkern with libc, it's not been used in the
last 15 years and there is no point to use it in the future.

From Jean-Philippe Ouellet

Remove assembly version of strlen from i386 and amd64, where it's
up to 3 times slower than the C code most of the time. This was
brought up by DragonflyBSD guys initially.

ok deraadt, guenther. mi

Remove assembly version of strlen from i386 and amd64, where it's
up to 3 times slower than the C code most of the time. This was
brought up by DragonflyBSD guys initially.

ok deraadt, guenther. miod will not miss it.

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Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

initial import of NetBSD tree