Revert "Ensure MemCacheStore is required when using CompressedMemCacheStore...

Revert "Ensure MemCacheStore is required when using CompressedMemCacheStore since they are lazy load now."

This reverts commit dd4181f4.

activesupport/lib/active_support/cache/compressed_mem_cache_store.rb

-require "active_support/cache/mem_cache_store"
-
 module ActiveSupport
   module Cache
     class CompressedMemCacheStore < MemCacheStore