Make GNU diff and GNU grep optional

[emaste]

share/mk/src.opts.mk

102

Note that this one is a little strange, in that I think we'll have the following result:

GNU_GREP	BSD_GREP	Result
no	no	/usr/bin/bsdgrep = BSD grep
no	yes	/usr/bin/grep = BSD grep
yes	no	/usr/bin/grep = GNU grep, /usr/bin/bsdgrep = BSD grep
yes	yes	/usr/bin/grep = BSD grep, /usr/bin/gnugrep = GNU grep

[brooks]

share/mk/src.opts.mk

102

Maybe make WITHOUT_GNU_GREP + WITHOUT_BSD_GREP fatal?

[emaste]

share/mk/src.opts.mk

102

I'm tempted to avoid trying to get too clever here; I think this change is primarily to allow experimentation with a gpl-free tree.

The build won't break WITHOUT_GNU_GREP and WITHOUT_BSD_GREP at least.

[emaste]

Connect OptionalObsoleteFiles

[emaste]

rS307674