Improve startup times for sigil generation.

tcshrc.prompt.defs

@@ -116,11 +116,7 @@ set referencechars_raw="${referencechars_raw} 2620"
 
 _debug "Building unicode sigils table...."
 if( ! $?CSHENV_NO_UNICODE_PRINTF ) then
-	set referencechars_original=()
-	foreach ch ($referencechars_raw)
-		set unicode=`printf "\\u${ch}"`
-		set referencechars_original=( $referencechars_original `printf "${unicode}"` )
-	end
+	set referencechars_original=( `printf "${referencechars_raw:as/ / \\u/}"` )
 else
 	# Safe fallback for when there's no unicode printf
 	set referencechars_original="A B C D X Y Z"