Add hyphen to RANDR output names for consistency with modesetting(4x)

--- src/sna/sna_display.c.orig	2018-12-03 09:01:25 UTC
+++ src/sna/sna_display.c
@@ -5126,7 +5126,7 @@ sna_output_add(struct sna *sna, unsigned id, unsigned 
 		output_name = output_names[compat_conn.conn.connector_type];
 	else
 		output_name = "UNKNOWN";
-	len = snprintf(name, 32, "%s%d", output_name, compat_conn.conn.connector_type_id);
+	len = snprintf(name, 32, "%s-%d", output_name, compat_conn.conn.connector_type_id);
 	if (output_ignored(scrn, name))
 		return 0;
 
--- src/uxa/intel_display.c.orig	2018-12-03 09:01:25 UTC
+++ src/uxa/intel_display.c
@@ -1484,7 +1484,7 @@ drmmode_create_name(ScrnInfoPtr pScrn, drmModeConnecto
 		else
 			output_name = "UNKNOWN";
 
-		snprintf(name, 32, "%s%d",
+		snprintf(name, 32, "%s-%d",
 			 output_name, koutput->connector_type_id);
 	}
 }