make coredispatcher fully BC again
Merge pull request #3759 from dereuromark/master-core-dispatcher

make coredispatcher fully BC again
Apply patch from 'biesbjerg' to ApcEngine

This set of changes allows ApcEngine to work with APCu and newer
versions of APC.

Fixes #3749
Remove else.

By returning early we can avoid the else statement entirely.
Skip autoloaders for APCIterator

We can skip autoloaders for this class as it is provided by
a C extension and will never come from userland code.
Merge branch 'master' into 2.6