Log Message:
Update php-apcu4 to 4.0.11.

Changes:

4.0.8:
- fix inconsistent member names for entries in userland
- fix race on ref_count

4.0.10:
- be really consistent with APC in use of atomics, avoid surprises

4.0.11:
- fix #176 segfault when apc.preload_path contains bad data
- fix bad data used in test suite