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kernel: evaluate dependencies of bootfs.proto files for bootfs.paq

expand the list of files specified in bootfs.proto and use them
as dependencies to bootfs.paq rule. this way, bootfs.paq is
regenerated when the to be included files have been modified.

--- a/sys/src/9/port/portmkfile

+++ b/sys/src/9/port/portmkfile

@@ -91,9 +91,12 @@

 boot$CONF.out: $CONF printstub.$O $BOOTLIB 

 	$BOOTDIR/mkboot $CONF > boot$CONF.c

 	$CC $CFLAGS boot$CONF.c

-	$LD -o boot$CONF.out boot$CONF.$O printstub.$O $BOOTLIB 

+	$LD -o boot$CONF.out boot$CONF.$O printstub.$O $BOOTLIB

-bootfs.paq:	../port/bootfs.proto

+bootfs.paq:	../port/bootfs.proto \

+		`{disk/mkfs -s / -ax ../port/bootfs.proto >[2]/dev/null \

+			| awk '/^end of archive/{exit}{print $1}' \

+			| while(x=`{read}){test -f $x && echo $x}}

 	mkdir -p bootfs

 	disk/mkfs -s / -d bootfs ../port/bootfs.proto

 	@{

-- 

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