workaround for a gettext string starting with --.

Workaround found in Advanced Bash-Scripting Guide, localization section.
"added a \0 (NULL) at the beginning of the sentence."

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

scripts/makepkg.sh.in

@@ -1187,7 +1187,7 @@ done
 if [ "$HOLDVER" = "1" -a "$FORCE_VER" != "" ]; then
 	# The extra '--' is here to prevent gettext from thinking --holdver is
 	# an option
-	error "$(gettext -- "--holdver and --forcever cannot both be specified")"
+	error "$(gettext "\\0--holdver and --forcever cannot both be specified" )"
 	exit 1
 fi