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mk9: make this stupid script do a backup

--- a/bin/mk9

+++ b/bin/mk9

@@ -5,12 +5,18 @@

 	cp /386/9bootfat /n/9fat/

 	chmod +al /n/9fat/9bootfat

 }

-if(test -f /n/9fat/9pc64)

+if(test -f /n/9fat/9pc64){

+	mv /n/9fat/9pc64^('' .bak)

 	cp /amd64/9pc64 /n/9fat/

-if(test -f /n/9fat/9pc)

+}

+if(test -f /n/9fat/9pc){

+	mv /n/9fat/9pc^('' .bak)

 	cp /386/9pc /n/9fat/

-if(test -f /n/9fat/9zynq)

+}

+if(test -f /n/9fat/9zynq){

+	mv /n/9fat/9zynq^('' .bak)

 	cp /arm/9zynq /n/9fat/

+}

 rm /srv/dos

 unmount /n/9fat

 unmount /n/9