message: add #[no_mangle] to sovrin_build_get_attrib_request
diff: @@ -252,6 +252,7 @@ pub extern fn sovrin_build_attrib_request(command_handle: i32,
  ///
  /// #Errors
  /// Common*
  +#[no_mangle]
  pub extern fn sovrin_build_get_attrib_request(command_handle: i32,
  submitter_did: *const c_char,
  target_did: *const c_char,
  