Update for proplib(3) API changes.

kill Id RCS keyword.

avoid sys/systm.h in userland ppath.h.
include types.h/stdarg.h in all systm.h configs.

my amd64 build without man pages now worked at least.

Include <sys/systm.h> for panic()

Add sources, Makefiles, and manual pages for ppath(3), a
property-container path library that is usable from both userland and
the kernel.

TBD: hook this into the build, update set lists, and add au

Add sources, Makefiles, and manual pages for ppath(3), a
property-container path library that is usable from both userland and
the kernel.

TBD: hook this into the build, update set lists, and add automated
tests.

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