test: fix tres4.pp - it required unit windows on windows systems

git-svn-id: trunk@14457 -

tests/test/units/system/tres4.pp

@@ -4,9 +4,10 @@ program tres4;
 
 
 uses
+{$ifdef MSWINDOWS}
+  windows,
+{$endif}
   classes,
-
-
   sysutils;
 
 {$R tres4.res}