This may need more work to prevent warning messages during
"make cleandir" when the commands in "!=" assignments are executed
even though tools may not have been built.
* Don't bother prefixing commands with a line of ${_MKCMD}\
and instead rely upon "make -s". This is less intrusive on
all the Makefiles than the former. Idea from David Laight.
* Rename the variables use to print messages. The scheme now is:
_MKMSG_FOO Run _MKMSG 'foo'
_MKTARGET_FOO Run _MKMSG_FOO ${.TARGET}
From discussion with Alistair Crooks.
Rework a bunch of make .for loops into sh for loops.
(XXX: This stuff could be implemented in a more efficient manner that
does a lot less of SOMEMAKEVAR!=some shell command , etc etc)
apb