ZF-12371: ZendServer_ShMem cannot be loaded on linux
Due to the fact that linux has case sensitive paths, i cannot load ZendServer_ShMem.
In Zend_Cache::__makeBackend_ there is a call to Zend_Cache::__normalizeName_. In Zend_Cache::__normalizeName_ the capital M in ShMem is lost. This causes that the right file cannot be loaded.