Unbreak bsd.progs.mk with PROGS (but not PROGS_CXX) and when invoking the
"one of many" targets, e.g. make hello_world, where hello_world is a C
program

Tested with: PROGS and PROGS_CXX
MFC after: 1 week
X-MFC with: r289289
Sponsored by: EMC / Isilon Storage Division