Utils: Drop OsType parameter from CommandLine functions

The type is implicitly given by the command's executble FilePath.

Also, rename the rarely used addArgs(const CommandLine &) overload
to addCommandLineAsArgs() and make it strip scheme and host from
the wrapped executable as there are no uses expected where keeping
them would be the right thing.

Change-Id: Id0b76778e7e01ac16e477f36bf30bb28d96bb177
Reviewed-by: Artem Sokolovskii <artem.sokolovskii@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -3841,7 +3841,7 @@ void GdbEngine::setupEngine()
     Environment gdbEnv = rp.debugger.environment;
     if (rp.runAsRoot) {
         CommandLine wrapped("sudo", {"-A"});
-        wrapped.addArgs(gdbCommand);
+        wrapped.addCommandLineAsArgs(gdbCommand);
         gdbCommand = wrapped;
         RunControl::provideAskPassEntry(gdbEnv);
     }