Debugger: Add pledges

Author: https://github.com/itamar8910
Commit: 479348c9e7
Pull-request: https://github.com/SerenityOS/serenity/pull/1745
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/awesomekling

Applications/Debugger/DebugSession.cpp

@@ -77,7 +77,6 @@ OwnPtr<DebugSession> DebugSession::exec_and_attach(const String& command)
         return nullptr;
     }
 
-    // TOOD: do we actually need this waitpid?
     if (waitpid(pid, nullptr, WSTOPPED) != pid) {
         perror("waitpid");
         return nullptr;