Update to 1.3.7c
    
    - New upstream release 1.3.7c
      - Improve mod_tls log messages for unsupported older TLS protocol requests
        (GH#1273)
      - Fix memory disclosure to RADIUS servers by mod_radius (GH#1284)
      - Properly handle <VirtualHost> sections that use interface/device names
        (GH#1282)
      - PCRE expressions with capture groups are not being handled properly
        (GH#1300)
      - AuthUserFile permissions check fails during SIGHUP, causing ProFTPD to
        stop (GH#1307)