release.sh: remove support for the -d flag

this lets you change the directory for outputted
release files, versus the default "release" directory.

this code is buggy, because it could let you overwrite
a part of xbmk or worse - and checking for such bad
usage would require a lot more code.

knobs are for nobs.

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

include/release.sh

@@ -9,10 +9,9 @@ release()
 
 	reldir="release"
 
-	while getopts d:m: option; do
+	while getopts m: option; do
 		[ -z "$OPTARG" ] && err "empty argument not allowed"
 		case "$option" in
-		d) reldir="$OPTARG" ;;
 		m) relmode="$OPTARG" ;;
 		*) err "invalid option '-$option'" ;;
 		esac