Of course it doesn't matter. That's a job perk. It also helps shape the applicant pool in desirable ways, I think. If I'm doing the hiring, and you really prefer developing code in a Windows environment over any kind of Unix (which includes Mac), then that's one strike against you.
I would never hold an environment against a developer - the talent is what matters most to me, and turning someone down because of that seems foolish to me.
