Update squid27 package to 2.7.7 (2.7.STABLE7).

pkgsrc changes: add LICENSE.

Changes to squid-2.7.STABLE7 (17 September 2009)
- Bug #2661 - Solaris /dev/poll support broken with EINVAL
- Clarify external_acl_type %{Header} documentation slightly
- Bug #2482: Remove mem_obj->old_entry in async code to avoid deep ctx
  errors
- GCC-4.x cleanups
- Bug #2605: Don't call setsid() on helper childs when running in
  daemon mode
- Windows port: Fix PSAPI.DLL usage, is always available on Windows NT
  and later
- Windows port: Added support for Windows 7, Windows Server 2008 R2
  and later
- Bug #2602: increase MAX_URL to 8192
- The debug mode option '-d' was not documented in LDAP helpers usage
  message
- Windows port: Added a note about installation on Windows Vista and
  later
- Bug #2642: Remove duplicate peerMonitorInit() on reconfigure
- Bug #2515: Final chunk parsing errors on FreeBSD6+
- Bug #2647: Reprioritise override-* and stale-while-revalidate
- Windows port: Fix improper access permissions to registry and DNS
  parsing from registry
- Windows port: Fix getservbyname() usage abuse.
- Bug #2672: cacheMemMaxSize 32-bit overflow during snmpwalk
- Bug #2691: store_url memory leak
- Accept PUT/POST requests without an entity-body
- Plug request_t + HttpStateData memory leak on PUT/POST requests with
  early response
- Bug #2710: squid_kerb_auth non-terminated string
- Bug #2369: squid traffic counter 32-bit overflow
- Bug #2080: wbinfo_group.pl - false positive under certain conditions
- Bug #2739: DNS resolver option ndots can't be parsed from
  resolv.conf
- Windows port: fix mswin_negotiate_auth.exe crash when executing a
  LocalCall authentication with verbose deBug #enabled
- Add 0.0.0.0 as an to_localhost address
- Windows port: Update mswin_check_ad_group to version 2.0
- Windows port: There is no "-P" command line option into
  mswin_check_ad_group helper.
- Correct Valgrind mempool protection
- Bug #2451: Correct length handling on 304 responses
- Bug #2541: Hang in 100% CPU loop while extacting header details
  using a delimiter other than comma (external_acl_type,
  access_log_format, external_refresh_check)
- Bug #2768 - squid_ldap_group -K argument parsing error

(taca)