Merge pull request #1174 from Kijewski/remove-Makefile.unsupported

make: Remove `Makefile.unsupported`

Makefile.unsupported

-.PHONY: all clean
-
-all:
-	$(error Project $(PROJECT) currently not supported for $(BOARD))
-
-clean:
-	@true

tests/test_nativenet/Makefile

-export PROJECT = test_nativenet
+PROJECT = test_nativenet
 include ../Makefile.tests_common
 
 BOARD_WHITELIST := native
 
-ifeq (,$(filter native,$(BOARD)))
-include $(RIOTBASE)/Makefile.unsupported
-else
-
 USEMODULE += nativenet
 USEMODULE += transceiver
 
@@ -18,5 +14,3 @@ FORCE:
 sender: CFLAGS += -DSENDER
 sender: PROJECT = test_nativenet_sender
 sender: FORCE all
-
-endif