Adjust the Cooja build system to the new build output dir structure

arch/platform/cooja/Makefile.cooja

@@ -34,10 +34,10 @@ endif
 
 endif ## QUICKSTART
 
-#MAIN_SRC = $(OBJECTDIR)/$(LIBNAME).c
-MAIN_OBJ = $(OBJECTDIR)/$(LIBNAME).o
-ARCHIVE = $(OBJECTDIR)/$(LIBNAME).a
-JNILIB = $(OBJECTDIR)/$(LIBNAME).$(TARGET)
+#MAIN_SRC = $(BUILD_DIR_BOARD)/$(LIBNAME).c
+MAIN_OBJ = $(BUILD_DIR_BOARD)/$(LIBNAME).o
+ARCHIVE = $(BUILD_DIR_BOARD)/$(LIBNAME).a
+JNILIB = $(BUILD_DIR_BOARD)/$(LIBNAME).$(TARGET)
 CONTIKI_APP_OBJ = $(CONTIKI_APP).o
 
 ### COOJA platform sources

arch/platform/cooja/Makefile.customrules-cooja

@@ -10,11 +10,11 @@ CUSTOM_RULE_LINK=1
 
 REDEF_PRINTF=1 # Redefine functions to enable printf()s inside Cooja
 
-# NB: Assumes ARCHIVE was not overridden and is in $(OBJECTDIR)
+# NB: Assumes ARCHIVE was not overridden and is in $(BUILD_DIR_BOARD)
 $(ARCHIVE): $(CONTIKI_OBJECTFILES) | $(OBJECTDIR)
 	$(AR_COMMAND_1) $^ $(AR_COMMAND_2)
 
-# NB: Assumes JNILIB was not overridden and is in $(OBJECTDIR)
+# NB: Assumes JNILIB was not overridden and is in $(BUILD_DIR_BOARD)
 $(JNILIB): $(CONTIKI_APP_OBJ) $(MAIN_OBJ) $(PROJECT_OBJECTFILES) $(ARCHIVE) | $(OBJECTDIR)
 
 ifdef REDEF_PRINTF