mk: add forx function for shorthand loops

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/fw/inject.sh

@@ -24,8 +24,7 @@ inject()
 	archive="$1";
 	new_mac="xx:xx:xx:xx:xx:xx"
 
-	nuke=""
-	xchanged=""
+	eval "`newvar nuke xchanged`"
 
 	[ $# -gt 1 ] && case "$2" in
 	nuke)
@@ -169,9 +168,7 @@ modify_mac()
 	x_ cp "${CONFIG_GBE_BIN_PATH##*../}" "$xbtmp/gbe"
 
 	if [ -n "$new_mac" ] && [ "$new_mac" != "restore" ]; then
-		x_ make -C util/nvmutil clean
-		x_ make -C util/nvmutil
-
+		forx 'x_ make -C util/nvmutil %s' clean nvmutil
 		x_ "$nvmutil" "$xbtmp/gbe" setmac "$new_mac"
 	fi
 

include/fw/rom.sh

@@ -131,10 +131,7 @@ mkcorebootbin()
 		return 0
 
 	$if_not_dry_build \
-		check_coreboot_util cbfstool
-
-	$if_not_dry_build \
-		check_coreboot_util ifdtool
+		forx 'check_coreboot_util %s' cbfstool ifdtool
 
 	for y in "$target_dir/config"/*; do
 		defconfig="$y"

include/fw/vendor.sh

@@ -443,10 +443,7 @@ bootstrap()
 	x_ "$mk" -f coreboot "${cbdir##*/}"
 	x_ "$mk" -f me_cleaner
 
-	x_ "$mk" -b bios_extract
-	x_ "$mk" -b biosutilities
-	x_ "$mk" -b uefitool
-	x_ "$mk" -b libarchive # for bsdtar and bsdunzip
+	forx 'x_ \"$mk\" -b %s' bios_extract biosutilities uefitool libarchive
 
 	[ -d "${kbc1126_ec_dump%/*}" ] && \
 		x_ make -C "$cbdir/util/kbc1126"