getting Win32 Messagebox to work

[Adam D. Ruppe]

On Friday, 26 October 2018 at 12:56:21 UTC, rikki cattermole 
wrote:
> MessageBoxA(null, cast(const(char)*)content.ptr, 
> cast(const(char)*)"Window title".ptr, 0);

Get rid of those casts, they are unnecessary.