Update BUILD.md to install adb package
PR <https://github.com/Genymobile/scrcpy/pull/965>
@@ -40,7 +40,7 @@ Install the required packages from your package manager.
```bash
# runtime dependencies
-sudo apt install ffmpeg libsdl2-2.0-0
+sudo apt install ffmpeg libsdl2-2.0-0 adb
# client build dependencies
sudo apt install gcc git pkg-config meson ninja-build \
