Generate c source code dependence with c compiler and flags

It's wrong to invoke the c++ compiler with c++ flags

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I2536daa764275221ca530fd5abfc7568af921570

Application.mk

@@ -216,11 +216,8 @@ register::
 endif
 
 .depend: Makefile $(wildcard $(foreach SRC, $(SRCS), $(addsuffix /$(SRC), $(subst :, ,$(VPATH))))) $(DEPCONFIG)
-ifeq ($(filter %$(CXXEXT),$(SRCS)),)
-	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(filter-out Makefile,$(filter-out $(DEPCONFIG),$^)) >Make.dep
-else
-	$(Q) $(MKDEP) $(DEPPATH) "$(CXX)" -- $(CXXFLAGS) -- $(filter-out Makefile,$(filter-out $(DEPCONFIG),$^)) >Make.dep
-endif
+	$(Q) $(MKDEP) $(DEPPATH) "$(CC)" -- $(CFLAGS) -- $(filter-out %$(CXXEXT) Makefile $(DEPCONFIG),$^) >Make.dep
+	$(Q) $(MKDEP) $(DEPPATH) "$(CXX)" -- $(CXXFLAGS) -- $(filter-out %.c Makefile $(DEPCONFIG),$^) >>Make.dep
 	$(Q) touch $@
 
 depend:: .depend