Suppress unused param warning

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@5966 4407c894-4637-0410-b4f5-ada5f102cad1
winbase.h: Don't use inline wrappers for Interlocked* functions on GCC versions that have broken dllimport.

Patch by David Wohlferd limegreensocks@yahoo.com

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@5967 4407c894-4637-0410-b4f5-ada5f102cad1