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 247fef66)