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9pc64/mkfile: add 'mk install.$part' command

it's convenient to have a command that backs up the old kernel and
installs a new one; this adds it, and removes the broken EXTRACOPIES
argument.

--- a/sys/src/9/pc64/mkfile

+++ b/sys/src/9/pc64/mkfile

@@ -84,9 +84,14 @@

 install:V:	$p$CONF

 	cp $p$CONF /$objtype/

-	for(i in $EXTRACOPIES)

-		import $i / /n/$i && cp $p$CONF $p$CONF.gz /n/$i/$objtype/

+install.%:V:	$p$CONF

+	@{

+	rfork n

+	9fs $stem

+	test -e /n/$stem/$p$CONF && cp /n/$stem/$p$CONF /n/$stem/$p$CONF.o

+	cp $p$CONF /n/$stem/$p$CONF

+	}

 # copies generated by the rule below

 PCHEADERS=usbehci.h screen.h mp.h io.h ahci.h \

-- 

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