Log Message:
py-curl: update to 7.43.0.3.

Version 7.43.0.3 [requires libcurl-7.19.0 or better] - 2019-06-17
-----------------------------------------------------------------

        * Fixed use with libcurl 7.65+ when FTP support is disabled.

        * Added support for mbedTLS (patch by Josef Schlehofer).

        * Fixed string processing on Python 3 (patch by Dmitriy Taychenachev).

        * Added CURLOPT_TCP_FASTOPEN and CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
          (patch by Khavish Anshudass Bhundoo).

        * Repaired inability to install PycURL when libcurl is using an SSL
          backend other than the ones PycURL explicitly recognizes and
          handles (OpenSSL, LibreSSL, BoringSSL, GnuTLS, NSS).
          The requirement for setup.py to detect an SSL backend if libcurl
          is configured to use SSL, added in 7.43.0.2, has been changed
          to a warning to allow this.