META MODE: Don't double stage SYMLINKS for libraries.

META MODE: Don't double stage SYMLINKS for libraries.

meta.stage.mk is handling ${SYMLINKS:T} for stage_libs already.  The logic in
bsd.sys.mk to handle ${SYMLINKS} was brought in r247817 when it was moved out
of bsd.prog.mk and bsd.lib.mk into bsd.sys.mk.  The logic previously was
limited to bsd.prog.mk.

This fixes a race, seen easily in lib/libthr, where libpthread_p.a is created
by both stage_libs and stage_symlinks resulting in 'ln: File exists'.

Sponsored by:	EMC / Isilon Storage Division