Update p5-FCGI to 0.74.

Version 0.74 --  24 Sep 2011 <rafl@debian.org>
  o Stop leaking information across requests when using the deprecated
    and undocumented old FCGI interface. This is CVE-2011-2766.
  o Only discard input stream if FCGI_KEEP_CONN is set in
    FCGI_BeginRequestBody flags.

(obache)