Make sure the main library core makefile does not interfere with the Doxygen...

Make sure the main library core makefile does not interfere with the Doxygen module configuration if included in a legacy makefile.

LUFA/makefile

@@ -12,8 +12,6 @@
 LUFA_VERSION_NUM        := $(shell grep LUFA_VERSION_STRING Version.h | cut -d'"' -f2)
 EXCLUDE_FROM_EXPORT     := Documentation DoxygenPages CodeTemplates Build *.conf *.tar *.o *.lss *.lst *.hex *.elf *.hex *.eep *.map *.bin *.d
 
-DOXYGEN_OVERRIDE_PARAMS = PROJECT_NUMBER=$(LUFA_VERSION_NUM)
-
 all:
 
 export_tar:
@@ -30,11 +28,9 @@ ifneq ($(LUFA_PATH),)
   LUFA_ROOT_PATH = $(LUFA_PATH)/LUFA/
   include $(LUFA_PATH)/LUFA/Build/lufa.sources.in
 else
-  LUFA_BUILD_MODULES += LIBCORE
-  LUFA_BUILD_TARGETS += export_tar version
-
   LUFA_PATH               = .
   ARCH                    = {AVR8,UC3,XMEGA}
+  DOXYGEN_OVERRIDE_PARAMS = QUIET=YES PROJECT_NUMBER=$(LUFA_VERSION_NUM)
   
   clean:
 	rm -f $(LUFA_SRC_ALL_FILES:%.c=%.o)