Added Makefile.local, a file with a single comment. The main
Makefile includes Makefile.local just before the first all rule.
One may overtide any Makefile setting by modifying Makefile.local.
For example, Makefile.local could force BLD_TYPE:
HAVE_STRING_H:= YES
HAVE_TIMES_H:= YES
SED:= /usr/local/bin/nsed
Added ${LOC_MKF} to specify the make of the file that is
included just before the all file. So one could place
the above override lines into a different file and call
make changing the ${LOC_MKF} value. For example:
make LOC_MKF=Makefile.private clobber all chk
