Remove now unused md5sum.sh script

Makefile

@@ -245,7 +245,6 @@ clean: FORCE
 	rm -f $(gluon_prepared_stamp)
 
 
-export MD5SUM := $(GLUONDIR)/scripts/md5sum.sh
 export SHA512SUM := $(GLUONDIR)/scripts/sha512sum.sh
 
 

scripts/md5sum.sh

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-check_command() {
-	which $1 >/dev/null 2>&1
-}
-
-if check_command md5sum; then
-	ret="$(md5sum "$@")"
-elif check_command md5; then
-	ret="$(md5 -q "$@")"
-else
-	echo "$0: no suitable md5sum implementation was found" >&1
-	exit 1
-fi
-
-[ "$?" -eq 0 ] || exit 1
-
-echo "$ret" | awk '{ print $1 }'