Ultimately all static strings should be qstr. This entry in the type
structure is only used for printing error messages (to tell the type of
the bad argument), and printing objects that don't supply a .print method.
Up to know changes unix/main.c were able to break the windows
build because windows/main.c simply included unix/main.c.
Now windows/main.c stands on it's own and won't break if
unix/main.c changes.