Silence function pointer to void* cast warning in invalid_parameter_handler.c

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@5946 4407c894-4637-0410-b4f5-ada5f102cad1
winbase: define out Virtual* functions for Windows Store apps

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@5947 4407c894-4637-0410-b4f5-ada5f102cad1