The Emacs (with module) will try load module with compressed suffix ".gz", for example, (require 'X) will trigger emacs try load file X.dll, X.dll.gz... on windows, but the "X.dll.gz" does not loadable, it affects performance especially on windows.

This patch make the (get-load-suffixes) function return result contains the ".dll" but avoid the ".dll.gz". 

Please help review the patch. Thank you.