libc: Fix up compat-43 a bit.

* Functions in libc/compat-43 aren't syscalls so move their manual
pages to section 3.

* Move the stuff that is still POSIX to libc/gen: creat, gethostid,
getwd, k

libc: Fix up compat-43 a bit.

* Functions in libc/compat-43 aren't syscalls so move their manual
pages to section 3.

* Move the stuff that is still POSIX to libc/gen: creat, gethostid,
getwd, killpg. compat-43 isn't the right place for them.

* While here, a non-existant .PATH in compat-43/Makefile.inc.

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