tcptls: Avoiding ERR_remove_state in OpenSSL.

ERR_remove_state was deprecated with OpenSSL 1.0.0 and was replaced by 
ERR_remove_thread_state. ERR_load_SSL_strings and ERR_load_BIO_strings were 
called by SSL_load_error_strings already and got removed. These changes allow 
OpenSSL forks like BoringSSL to be used with Asterisk.

ASTERISK-25043 #close
Reported by: Alexander Traud
patches:
  asterisk_with_BoringSSL.patch uploaded by Alexander Traud (License 6520)

Change-Id: If1c0871ece21a7e0763fafbd2fa023ae49d4d629
(cherry picked from commit 247fef6653)

main/tcptls.c

@@ -400,7 +400,11 @@ static int tcptls_stream_close(void *cookie)
 
 			if (!stream->ssl->server) {
 				/* For client threads, ensure that the error stack is cleared */
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+				ERR_remove_thread_state(NULL);
+#else
 				ERR_remove_state(0);
+#endif	/* OPENSSL_VERSION_NUMBER >= 0x10000000L */
 			}
 
 			SSL_free(stream->ssl);