Windows, docs: must install `patch` in MSYS2
Fixes
@@ -114,7 +114,7 @@ Unix-like systems.)
* **The MSYS2 packages for zip and unzip.** Run the following command in the MSYS2 shell:
```
- pacman -Syu zip unzip
+ pacman -S zip unzip patch
```
* **The Visual C++ compiler.** Install the Visual C++ compiler either as part
