Now works with older pike's again.

Rev: tutorial/Wmml.pmod:1.20
Rev: tutorial/wmmltohtml2:1.6

tutorial/Wmml.pmod

 #include "types.h"
+#if __VERSION__ >= 0.6
 import ".";
+#endif /* __VERSION__ >= 0.6 */
 import Sgml;
 
 SGML low_make_concrete_wmml(SGML data);

tutorial/wmmltohtml2

 #!/usr/local/bin/pike
 
 import Stdio;
+#if __VERSION__ >= 0.6
 import ".";
+#endif /* __VERSION__ >= 0.6 */
 
 #include "types.h"