tools(gcc): modify win32 cross toolchain download URL
ZIP file is better for windows platform.
@@ -38,7 +38,7 @@ Actions to be taken for *ESP8266_RTOS_SDK v3.0* include the following items:
v5.2.0
-* [Windows](https://dl.espressif.com/dl/xtensa-lx106-elf-win32-1.22.0-100-ge567ec7-5.2.0.tar.gz)
+* [Windows](https://dl.espressif.com/dl/xtensa-lx106-elf-win32-1.22.0-100-ge567ec7-5.2.0.zip)
* [Mac](https://dl.espressif.com/dl/xtensa-lx106-elf-macos-1.22.0-100-ge567ec7-5.2.0.tar.gz)
* [Linux(64)](https://dl.espressif.com/dl/xtensa-lx106-elf-linux64-1.22.0-100-ge567ec7-5.2.0.tar.gz)
* [Linux(32)](https://dl.espressif.com/dl/xtensa-lx106-elf-linux32-1.22.0-100-ge567ec7-5.2.0.tar.gz)
