These files had tags after teh copyright notice,
inside the comment block (incorrect, removed),
and outside the comment block (correct).
Approved by: rwatson (mentor)
When it is called directly, gcc is smart enough to generate inline
code for it, which is why it wasn't noticed before that it was missing.
fabs() would probably better fit into libm, but it has traditionally been
in libc on FreeBSD, so there is probably software around that makes
assumptions about this by now.
