Makefile.include: set APPDEPS as BUILDDEPS

Use BUILDDEPS to define the APPDEPS dependency

Makefile.include

@@ -366,6 +366,7 @@ DIRS += $(EXTERNAL_MODULE_DIRS)
 
 # Define dependencies required for building (headers, downloading source files,)
 BUILDDEPS += $(RIOTBUILD_CONFIG_HEADER_C)
+BUILDDEPS += $(APPDEPS)
 
 # Save value to verify it is not modified later
 _BASELIBS_VALUE_BEFORE_USAGE := $(BASELIBS)
@@ -390,7 +391,7 @@ endif # RIOTNOLINK
 $(ELFFILE): $(BASELIBS)
 	$(Q)$(_LINK) -o $@
 
-$(BINDIR)/$(APPLICATION_MODULE).a: $(USEPKG:%=$(BINDIR)/%.a) $(APPDEPS) $(BUILDDEPS)
+$(BINDIR)/$(APPLICATION_MODULE).a: $(USEPKG:%=$(BINDIR)/%.a) $(BUILDDEPS)
 	$(Q)DIRS="$(DIRS)" "$(MAKE)" -C $(APPDIR) -f $(RIOTMAKE)/application.inc.mk
 $(BINDIR)/$(APPLICATION_MODULE).a: FORCE