Rotozoom without the skew

[SMcNeill]

I'll have to check later to see if my DisplayImage suffers from this same skew problem.  https://staging.qb64phoenix.com/showthread.php?tid=133

Yup, just checked it shows the skew on rotating when x and y aren't the same scale.

Hopefully I've fixed that.  (I followed your changes to rotozoom as a basic roadmap to my own changes, so I hope they're right now.)  At least, it seems to be working to me, but heck; I never noticed the problem to begin with!  I'ma gonna pretend that it's working now, until someone tells me that it isn't.  LOL!