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bootrc: simplify bootargs splitting avoiding awk

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -70,8 +70,9 @@

 		}

 		if not bootargs=$nobootprompt

 		nobootprompt=()

-		mn=`{echo $bootargs | awk -F! '{print $1}'}

-		ma=`{echo $bootargs | sed 's/[^!]*!?//'}

+		mn=`{echo $bootargs | sed 's,!, ,'}

+		ma=$mn(2-)

+		mn=$mn(1)

 		switch(m$"mn){

 		case $mt

 			mp=m$mn