Function CopyFileExA 

pub unsafe extern "system" fn CopyFileExA(
    lpexistingfilename: PCSTR,
    lpnewfilename: PCSTR,
    lpprogressroutine: LPPROGRESS_ROUTINE,
    lpdata: *const c_void,
    pbcancel: *mut BOOL,
    dwcopyflags: COPYFILE_FLAGS,
) -> BOOL