add mode lines to new files (and idls) since last run

Change-Id: Id1e74f18c90e69d1a781c8f02e30dc3c005ed4fd

compilerplugins/clang/unusedvariablecheck.cxx

@@ -1,3 +1,4 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /*
  * This file is part of the LibreOffice project.
  *
@@ -110,3 +111,5 @@ static Plugin::Registration< UnusedVariableCheck > X( "unusedvariablecheck" );
 } // namespace
 
 #endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */