Following up on r1534153, remove harmless duplicate provider registration in
the javahl code.

* subversion/bindings/javahl/native/OperationContext.cpp
  (OperationContext::getAuthBaton): Assume that the windows CryptoApi
    certificate verification is already handled in the earlier call to
    svn_auth_get_platform_specific_client_providers.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1534198 13f79535-47bb-0310-9956-ffa450edef68