Update php-apc package to 3.1.6.

3.1.6 2010-11-30

- make slam_defense a little more optimistic, allow a thread/process to write
  to cache in a loop
- ensure realpaths hit the realpath_cache, in no-stat mode
- prevent memory starvation, nuke all caches when expunging just one doesn't
  work
- fix uploadprogress keylength issues (NUL is part of keylen, pecl bug #20016)

3.1.5 2010-11-02

- Reduce usage of CG(open_files) (mkoppanen at php dot net)
- Add support for php-trunk, new op code, new internals string format,
  etc. (Dmitry)
- apc_debug are not compiler-valid NOPs for non-debug builds

- Fixed relative paths resolution when ./foo/a.php or ../foo/a.php (or similar
  path) are used. 'foo/a.php' path behaviors remain unchanged
- Fixed a possible memory corruption, when partial path cannot be resolved by
  expand_filepath()
- Fixed notices in apc.php (Tomasz Krawczyk)

- Fixed Bug #17978: standardize user keys to include NULs in
  identifier_len. Z_STRLEN_P() doesn't, so add to it.
- Fixed bug #16966, apc produces tons of warnings "Unable to allocate memory
  for pool".

- Added --enable-apc-debug configuration argument to enable debugging (Kalle)
- Added support for internal debugging on Windows (Kalle)
- ZTS optimizations (Kalle)

3.1.4 2010-08-05

- Windows builds may now have filehits and memory protection if enabled
  (Kalle)
- Renamed the memory protection configure option to --enable-apc-memprotect
  (Kalle, Shire)
- ZTS fixes and optimizations (Kalle, Felipe)
- Win32 stat support (Pierre, Kalle)
- Added support for interned strings, run-time caches and Zend Engine 2.4
  (Dmitry)
- Added apc_exists() (Rasmus)
- Fixed potential XSS in apc.php (Pierre, Matt Chapman)
- Fixed pecl bug #17597 (keys with embedded NUL) (Gopal)
- Fixed pecl bug #17650 (Fix goto jump offsets) (Gopal)
- Fixed pecl bug #17527 (Standardized error reporting) (Gopal, Paul Dragoonis)
- Fixed pecl bug #17089 (Scrub the constant table of all inherited members
  before caching) (Gopal)
- Fixed pecl bug #16860 (files can be included more than once even when
  include/require_once are used) (Pierre)
- Fixed pecl bug #16717 (apc_fetch dies after 1 hour, regardless of ttl
  settings) (Kalle)
- Fixed pecl bug #17597 (apc user cache keys with embedded NULs) (Gopal)
- Fixed pecl bug #13583 (apc upload progress fixes) (Gopal)

(taca)