installed by "make install") without setting of BUILD. All cases where BUILD
is already set are unchanged from the old behavior.
"make all install" is now practically equivalent to "make BUILD= all install",
but without actually setting build.
Fixes pr's 8313, 3894.
stuff duplication by expressing it in terms of <bsd.files.mk>. Allow for
multiple inclusion of <bsd.files.mk> by clearing ${FILES} at the end, and
using FILES+= rather than FILES= in <bsd.info.mk>.
and the filesystem is full. Added ${RENAME} flag to install, which when set
to -r installs on a temporary file and then renames to the final destination.
${RENAME} is currently set to nothing in bsd.own.mk, but one can turn it
on in /etc/mk.conf.
