splitting libc -> libc + libsys and static linking

[Brooks Davis]

We (mostly Ali) are working on a patch to to split the actual syscalls
(__sys_<foo>) out of libc and into a libsys.  For dynamic linking,
this is fairly straightforward (link libc against libsys, maybe as a
filter).  For static linking, I'm looking for feedback on the right
approach.  Do we link libsys.a into libc.a?  Do we try to teach all the
compilers to add -lsys?  I'm pretty sure we don't modify all the ports
that statically link programs.  Is there some easy approach I'm missing?

-- Brooks
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