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pc: fix mp boot regression due mistake in mkfile

the previous mkfile had a sneaky hack that would use
sed to delete the first 2 lines of hex output to strip
the 32 byte long a.out header for apbootstrap and rebootcode.

use 8l -H3 flag to strip the header from the output file.

--- a/sys/src/9/pc/mkfile

+++ b/sys/src/9/pc/mkfile

@@ -139,10 +139,10 @@

 	$LD -l -R1 -s -o $target $prereq

 rebootcode.out:		rebootcode.$O

-	$LD -l -R4 -s -o $target -T$REBOOTADDR $prereq

+	$LD -l -R4 -s -o $target -T$REBOOTADDR -H3 $prereq

 apbootstrap.out:	apbootstrap.$O

-	$LD -l -R4 -s -o $target -T$APBOOTSTRAP $prereq

+	$LD -l -R4 -s -o $target -T$APBOOTSTRAP -H3 $prereq

 sd53c8xx.i:	sd53c8xx.n

 	aux/na $prereq > $target