Initial OpenSSL 3.0 support (#1288)

* openssl-3:
  ci: use ubuntu 22.04 with OpenSSl 3.0 instead of building OpenSSL from sources
  ci: set LD_LIBRARY_PATH for openssl 3.0 build
  test: suppress warning for already defined SSL_get_peer_certificate
  autotools: print $OPENSSL_LIBS/$OPENSSL_INCS
  Suppress -Wunused-value for BIO_set_close()
  Use OPENSSL_VERSION_NUMBER over OPENSSL_VERSION_MAJOR (for compatibility)
  Attempt to add OpenSSL 3 to the Linux build matrix
  Initial OpenSSL 3.0 support