Updated sha1 hash for 64bit

To fix the following

```
brew install php53-ioncubeloader
==> Downloading http://downloads3.ioncube.com/loader_downloads/ioncube_loaders_dar_x86-64.tar.gz
Error: SHA1 mismatch
Expected: 67432f4b117cbd06b8e1297636bf3c0844b188da
Actual: 067c47387725db434ab0e7d486a2d6eff6fab37c
Archive: /Library/Caches/Homebrew/php53-ioncubeloader-4.2.2.tar.gz
(To retry an incomplete download, remove the file above.)
```