fixed stupid apc_store() behaviour
fixed stupid apc_store() behaviour

apc_store() cannot be called multiple times on the same key during
one request, just google "apc_store" for references.

This patch will call apc_delete() before trying to write any value.
Should not hurt the performance that much.

xrstf/babelcache,xrstf/babelcache,xrstf/babelcache