Remove indirection of _sub target for using _SUBDIR.

This reverts r266473 as the need for it, working around .MAKE and '+'
issues, is no longer needed after r289460.  This avoids extra log
output in -j builds of '-- _sub.TARGET --' that are redundant with the
'-- TARGET --' and '-- TARGET_subdir_DIR --' entries already showing.

r266473 also made a subtle change in the ordering of _SUBDIR handling.  Before
the change, SUBDIRS were recursed into after building the TARGET due to the
.USE of _SUBDIR *appending* the commands onto the TARGET.  After the change
though the indirection caused TARGET to depend on _sub.TARGET which had the
_SUBDIR handling in it.  This TARGET would run after recursing.  However, the
SUBDIR_PARALLEL handling from r263778 has this ordering as well.  Since
this has so far not been a problem, for now make this behavior for
non-SUBDIR_PARALLEL use of _SUBDIR explicit by using .USEBEFORE.
Further research may change this back to .USE as well as the
SUBDIR_PARALLEL handling and bsd.progs.mk recursing.

Sponsored by:	EMC / Isilon Storage Division

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