Fix broken APC submodule

The php-ext/apc submodule was pointing at a commit hash which doesn't
exist any more in the repo.

It seems like this commit has been re-written, so update it to point to
the correct SHA.
Merge pull request #18 from bradfeehan/dev

Fix broken APC submodule from @bradfeehan
Fix whitespaces
Fix php-src directory is created by git-submodule untimly

before the php-src directory is created by git-submodule, tries to move
the cd command