Makefile: Show INSTALL/REMOVE messages when make install/uninstall is run.

Without these messages the user have no idea what is happening and
this can be very confusing.

Makefile

@@ -5,6 +5,7 @@ all:
 	@echo "Run \"make install\" to install biTStream into $(INCLUDE)"
 
 install:
+	@echo "INSTALL  $(INCLUDE)"
 	@install -d $(INCLUDE)
 	@install -m 644 common.h $(INCLUDE)/
 	@install -d $(INCLUDE)/dvb
@@ -15,6 +16,7 @@ install:
 	@install -m 644 mpeg/* $(INCLUDE)/mpeg
 
 uninstall:
+	@echo "REMOVE   $(INCLUDE)"
 	@rm -rf $(INCLUDE)
 
 .PHONY: install uninstall