Update to 1.54
    
    - New upstream release 1.54
      - added support for SSL_export_keying_material where present (i.e. in OpenSSL
        1.0.1 and later)
      - changed t/handle/external/50_external.t to use www.airspayce.com instead of
        perldition.org, who no longer have an https server
      - patch to fix a crash: P_X509_get_crl_distribution_points on an X509
        certificate with values in the CDP extension that do not have an ia5 string
        would cause a segmentation fault when accessed
      - change in t/local/32_x509_get_cert_info.t to not use
        Net::SSLeay::ASN1_INTEGER_get, since it works differently on 32 and 64 bit
        platforms
      - updated author and distribution location details to airspayce.com
      - improvement to test 07_sslecho.t so that if set_cert_and_key fails we can
        tell why