Add support for 0.9.6 beta1 plus c99 patch

Makefile

@@ -7,6 +7,8 @@ UNZIP = unzip -q -o
 VENDOR_SDK_ZIP = $(VENDOR_SDK_ZIP_$(VENDOR_SDK))
 VENDOR_SDK_DIR = $(VENDOR_SDK_DIR_$(VENDOR_SDK))
 
+VENDOR_SDK_ZIP_0.9.6b1 = esp_iot_sdk_v0.9.6_b1_15_02_15.zip
+VENDOR_SDK_DIR_0.9.6b1 = esp_iot_sdk_v0.9.6_b1
 VENDOR_SDK_ZIP_0.9.5 = esp_iot_sdk_v0.9.5_15_01_23.zip
 VENDOR_SDK_DIR_0.9.5 = esp_iot_sdk_v0.9.5
 VENDOR_SDK_ZIP_0.9.4 = esp_iot_sdk_v0.9.4_14_12_19.zip
@@ -48,6 +50,10 @@ libcirom: $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/lib/libcirom.a
 
 sdk_patch: .sdk_patch_$(VENDOR_SDK)
 
+.sdk_patch_0.9.6b1:
+	patch -d $(VENDOR_SDK_DIR_0.9.6b1) -p1 < c_types-c99.patch
+	@touch $@
+
 .sdk_patch_0.9.5: sdk095_patch1.zip esp_iot_sdk_v0.9.5/.dir
 	$(UNZIP) $<
 	mv libmain_fix_0.9.5.a $(VENDOR_SDK_DIR)/lib/libmain.a
@@ -94,6 +100,9 @@ $(VENDOR_SDK_DIR)/.dir: $(VENDOR_SDK_ZIP)
 	-mv License $(VENDOR_SDK_DIR)
 	touch $@
 
+esp_iot_sdk_v0.9.6_b1_15_02_15.zip:
+	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=220"
+
 esp_iot_sdk_v0.9.5_15_01_23.zip:
 	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=189"