docs: Remove Linux dependencies that don't seem to be required anymore

Author: crumblingstatue

README.md

@@ -60,15 +60,8 @@ For more detailed instructions, see our [wiki page](https://github.com/ruffle-rs
 The following are typical dependencies for Linux:
 
 * libasound2-dev
-* libxcb-shape0-dev
-* libxcb-xfixes0-dev
-* libgtk-3-dev
 * libudev-dev
-* libxcb-xinput-dev
-* libxcb-xkb-dev
-* libxcb-cursor-dev
 * default-jre-headless
-* cmake
 * g++
 
 ### Desktop