MFC r274267:

MFC r274267:

  Use PROGS instead of PROG and remove unnecessary SRCS?= assignment

  Using PROG instead of PROGS will in cases of high -j with -DNO_ROOT cause
  the PROG to show up more than once as it's handling the SCRIPTS install case
  in a recursive manner, separate from the non-recursive case

  After the recent batch of commits to bsd.progs.mk to fix behavior with how
  variables are defaulted to, explicitly setting SRCS for a PROG is no longer
  required

  Reviewed by: asomers
  Phabric: D1130
  Sponsored by: EMC / Isilon Storage Division

git-svn-id: svn://svn.freebsd.org/base/stable/10@274539 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f