* xmlschemas.c: Removed inheritance of "mixed" content type for
  short-hand restrictions of "anyType" (reported by Guy Fabrice
  to the mailing list). Added the namespace conversion (chameleon
  includes) for the base type reference of <restriction> and
  <extension>.
* test/schemas/bug152470_1.xsd: Adapted due to the above change
  of "mixed" inheritance.