[M3commit] [modula3/cm3] 3c3a09: restore build_standalone

[jaykrell]

  Branch: refs/heads/master
  Home:   https://github.com/modula3/cm3
  Commit: 3c3a09b42bc969213d0ee0cc5346cefa46bf6d80
      https://github.com/modula3/cm3/commit/3c3a09b42bc969213d0ee0cc5346cefa46bf6d80
  Author: jaykrell <jay.krell at cornell.edu>
  Date:   2015-08-07 (Fri, 07 Aug 2015)

  Changed paths:
    M m3-sys/cm3/src/m3makefile

  Log Message:
  -----------
  restore build_standalone
it is quite important as long as we use "buildship" in upgrade
we should switch to a copy all at the end "make install destdir=" approach..