Revert "libc: Add temporary (get|set)affinity DF404.0 symbols"

This reverts commit 3c2537818c14aaba122a276020143cd4b92d2cbc.

As indicated in the original commit, the (get|set)affinity DF404.0
symbo

Revert "libc: Add temporary (get|set)affinity DF404.0 symbols"

This reverts commit 3c2537818c14aaba122a276020143cd4b92d2cbc.

As indicated in the original commit, the (get|set)affinity DF404.0
symbols were temporary and limited to the 4.7 development branch.
Now that 4.8 has been officially released, remove them as they
have served their purpose. By now, all software built on 4.7
should have been rebuilt and thus nothing depends on the mistake
symbols.

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libc: Add temporary (get|set)affinity DF404.0 symbols

The sched_getaffinity, sched_setaffinity and related work had the new
symbols erroneously given DF404.0 versioning. This was corrected by
commi

libc: Add temporary (get|set)affinity DF404.0 symbols

The sched_getaffinity, sched_setaffinity and related work had the new
symbols erroneously given DF404.0 versioning. This was corrected by
commit 6262c9d, but that in turn broke any userland programs built
with the original symbol versions.

This patch redefines the old symbols while maintaining the correct
DF408.0 versions, but it is intended to be temporary. After the
branch (e.g. Release 4.8), this commit should be reverted so that
the next development trunk won't have the DF404.0 versions. It's
expected that all ports and third-party software is rebuilt when
upgrading to a new release. This serves as a reasonable bridge
to allow affected users to do that rebuild.

This patch is particularly intrusive regarding the syscall assembly
file creation, so it's not something we want to leave in place
permanently in my opinion.

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lwp: Move all lwp syscalls to sys/lwp.h

Discussed-with: swildner, zrj

libc: Take cpusetsize into consideration for sched_getaffinity()

libc: Add sched_{set,get}affinity().

Same as other sched_ fucntions, these two functions do _not_ support
the overriding pid as tid as what Linux supports.