support aliyun sdk on TencentOS tiny

sample: examples\aliyun_iotkit_csdk_mqtt
project: board\TencentOS_tiny_EVB_MX_Plus\KEIL\aliyun_iotkit_csdk_mqtt

components/connectivity/iotkit-embedded-3.0.1/3rdparty/tools/parse_make_settings.mk

@@ -0,0 +1,17 @@
+include $(CURDIR)/tools/internal_make_funcs.mk
+
+SWITCH_VARS := \
+$(shell grep '''config [_A-Z]*''' \
+    $$(find -L $(TOP_DIR)/tools -name 'Config.*') \
+        | cut -d: -f2 \
+        | grep -v menuconfig \
+        | grep -v SRCPATH \
+        | awk '{ print $$NF }' \
+)
+SWITCH_VARS := $(foreach V,$(sort $(SWITCH_VARS)),FEATURE_$(V))
+
+$(foreach v, \
+    $(SWITCH_VARS), \
+    $(if $(filter y,$($(v))), \
+        $(eval CFLAGS += -D$(subst FEATURE_,,$(v)))) \
+)