Merge upstream changes from Marlin 2.1.2.2

buildroot/bin/mfutil

@@ -7,13 +7,12 @@
 which curl 1>/dev/null 2>&1 || { echo "curl not found! Please install it."; exit ; }
 which git 1>/dev/null 2>&1 || { echo "git not found! Please install it."; exit ; }
 
-SED=$(command -v gsed 2>/dev/null || command -v sed 2>/dev/null)
+SED=$(which gsed sed | head -n1)
 [[ -z "$SED" ]] && { echo "No sed found, please install sed" ; exit 1 ; }
 
 OPEN=$( which gnome-open xdg-open open | head -n1 )
 
 SELF=`basename "$0"`
-HERE=`dirname "$0"`
 
 # Check if called in the right location
 [[ -e "Marlin/src" ]] || { echo -e "This script must be called from a Marlin working copy with:\n ./buildroot/bin/$SELF $1" ; exit ; }