Update README docs related to local build (#1479)

* Update README docs related to local build

Closes #1476

* Update command per @ordian



Co-authored-by: Andronik Ordian <write@reusable.software>

* Remove reference to old install script

Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/README.md

@@ -45,7 +45,7 @@ rustup update
 Once done, finish installing the support software:
 
 ```bash
-sudo apt install make clang pkg-config libssl-dev
+sudo apt install build-essential git clang libclang-dev pkg-config libssl-dev
 ```
 
 Build the client by cloning this repository and running the following commands from the root