unify err functions across scripts

include/err.sh

this new handling also does mundane things,
such as tell you what script b0rked

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

resources/scripts/build/grub/utils

@@ -22,6 +22,8 @@
 [ "x${DEBUG+set}" = 'xset' ] && set -v
 set -u -e
 
+. "include/err.sh"
+
 main()
 {
 	printf "Building GRUB\n"
@@ -41,10 +43,4 @@ build_grub()
 	)
 }
 
-err()
-{
-	printf "%s: error: %s\n" $0 $1
-	exit 1
-}
-
 main $@