Windows, docs: must install `patch` in MSYS2

Fixes https://github.com/bazelbuild/bazel/issues/8076

PiperOrigin-RevId: 245700164

site/docs/install-compile-source.md

diff --git a/site/docs/install-compile-source.md b/site/docs/install-compile-source.md
index 9fd1a3b..d2f550e 100644
--- a/site/docs/install-compile-source.md
+++ b/site/docs/install-compile-source.md
@@ -114,7 +114,7 @@
 *   **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