Added SDK 1.5.0, not made default as it breaks backwards compatibility.

Per the release notes, -lcrypto needs to be added to avoid linking errors.

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_1.5.0 = esp_iot_sdk_v1.5.0_15_11_27.zip
+VENDOR_SDK_DIR_1.5.0 = esp_iot_sdk_v1.5.0
 VENDOR_SDK_ZIP_1.4.0 = esp_iot_sdk_v1.4.0_15_09_18.zip
 VENDOR_SDK_DIR_1.4.0 = esp_iot_sdk_v1.4.0
 VENDOR_SDK_ZIP_1.3.0 = esp_iot_sdk_v1.3.0_15_08_08.zip
@@ -73,6 +75,10 @@ libcirom: $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/lib/libcirom.a
 
 sdk_patch: .sdk_patch_$(VENDOR_SDK)
 
+.sdk_patch_1.5.0:
+	patch -N -d $(VENDOR_SDK_DIR_1.5.0) -p1 < c_types-c99.patch
+	@touch $@
+
 .sdk_patch_1.4.0:
 	patch -N -d $(VENDOR_SDK_DIR_1.4.0) -p1 < c_types-c99.patch
 	@touch $@
@@ -204,6 +210,9 @@ $(VENDOR_SDK_DIR)/.dir: $(VENDOR_SDK_ZIP)
 	-mv License $(VENDOR_SDK_DIR)
 	touch $@
 
+esp_iot_sdk_v1.5.0_15_11_27.zip:
+	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=989"
+
 esp_iot_sdk_v1.4.0_15_09_18.zip:
 	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=838"