SDK 1.5.4: Rename directory to avoid name clash with future versions.

For this version directory, as put by the vendor into zip file, lacks version
suffix.

Makefile

@@ -24,7 +24,7 @@ VENDOR_SDK_ZIP = $(VENDOR_SDK_ZIP_$(VENDOR_SDK))
 VENDOR_SDK_DIR = $(VENDOR_SDK_DIR_$(VENDOR_SDK))
 
 VENDOR_SDK_ZIP_1.5.4 = ESP8266_NONOS_SDK_V1.5.4_16_05_20.zip
-VENDOR_SDK_DIR_1.5.4 = ESP8266_NONOS_SDK
+VENDOR_SDK_DIR_1.5.4 = ESP8266_NONOS_SDK_V1.5.4_16_05_20
 VENDOR_SDK_ZIP_1.5.3 = ESP8266_NONOS_SDK_V1.5.3_16_04_18.zip
 VENDOR_SDK_DIR_1.5.3 = ESP8266_NONOS_SDK_V1.5.3_16_04_18/ESP8266_NONOS_SDK
 VENDOR_SDK_ZIP_1.5.2 = ESP8266_NONOS_SDK_V1.5.2_16_01_29.zip
@@ -168,6 +168,12 @@ $(VENDOR_SDK_DIR)/.dir: $(VENDOR_SDK_ZIP)
 	-mv License $(VENDOR_SDK_DIR)
 	touch $@
 
+$(VENDOR_SDK_DIR_1.5.4)/.dir: $(VENDOR_SDK_ZIP_1.5.4)
+	$(UNZIP) $^
+	mv ESP8266_NONOS_SDK $(VENDOR_SDK_DIR_1.5.4)
+	-mv License $(VENDOR_SDK_DIR)
+	touch $@
+
 sdk_patch: $(VENDOR_SDK_DIR)/.dir .sdk_patch_$(VENDOR_SDK)
 
 .sdk_patch_1.5.4: