Fix build dir outside of source

deps/Makefile

@@ -166,6 +166,8 @@ all: $(TARGETS)
 
 clean:
 	rm -f $(TARGETS)
+	rm -f $(DEP_PATH)/*.tgz
+	rm -f $(DEP_PATH)/*.tar.gz
 	rm -rf $(DEP_PATH)/bin
 	rm -rf $(DEP_PATH)/include
 	rm -rf $(DEP_PATH)/lib

src/Makefile

@@ -70,6 +70,7 @@ EXTRA_DEPENDENCIES = $(EXTRA_LIBS)
 # Do some magic
 
 DPF_PATH = ../dpf
+DPF_BUILD_DIR = ../build
 DPF_TARGET_DIR = ../bin
 include ../dpf/Makefile.plugins.mk