message: added no mangle for sovrin_build_get_claim_def_txn()
diff: @@ -440,6 +440,7 @@ pub extern fn sovrin_build_claim_def_txn(command_handle: i32,
  ///
  /// #Errors
  /// Common*
  +#[no_mangle]
  pub extern fn sovrin_build_get_claim_def_txn(command_handle: i32,
  submitter_did: *const c_char,
  xref: *const c_char,
  