ERR_remove_thread_state, ERR_remove_state - DEPRECATED
The following function has been deprecated since OpenSSL 1.0.0, and can be
  hidden entirely by defining OPENSSL_API_COMPAT with a suitable version
  value, see openssl_user_macros(7):
 void ERR_remove_state(unsigned long tid);
The following function has been deprecated since OpenSSL 1.1.0,
    and can be hidden entirely by defining OPENSSL_API_COMPAT with a
    suitable version value, see openssl_user_macros(7):
 void ERR_remove_thread_state(void *tid);
ERR_remove_state() frees the error queue associated with the specified
  thread, identified by tid. ERR_remove_thread_state() does the
  same thing, except the identifier is an opaque pointer.
ERR_remove_state() and ERR_remove_thread_state() return no value.
ERR_remove_state() was deprecated in OpenSSL 1.0.0 and
  ERR_remove_thread_state() was deprecated in OpenSSL 1.1.0; these
  functions and should not be used.
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Licensed under the Apache License 2.0 (the "License").
    You may not use this file except in compliance with the License. You can
    obtain a copy in the file LICENSE in the source distribution or at
    <https://www.openssl.org/source/license.html>.