Install carla-single script file (not for real use yet!)

Makefile

@@ -188,9 +188,9 @@ install:
 
 	# Adjust PREFIX value in script files
 	sed -i "s/X-PREFIX-X/$(SED_PREFIX)/" \
-		$(DESTDIR)$(PREFIX)/bin/carla
+		$(DESTDIR)$(PREFIX)/bin/carla \
+		$(DESTDIR)$(PREFIX)/bin/carla-single
 # 		$(DESTDIR)$(PREFIX)/bin/carla-control \
-# 		$(DESTDIR)$(PREFIX)/bin/carla-single
 
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