Added NOOBJ if anyone even attempts to "make obj" here.
Revert to installing files with mode 644 except README.
Make this overall look like a BSD-style Makefile rather
than roll-your-own (this is not a bug).
For the record. Previous revision also fixed the breakage
introduced by the sys.mk,v 1.60 commit: bsd.own.mk is no
longer automatically included from sys.mk.
Reported by: jhay
