Only use enable_if template on Windows.
Only use enable_if template on Windows.

This isn't required and doesn't compile on older GCC versions.

wpilibsuite/ntcore,wpilibsuite/ntcore,wpilibsuite/ntcore,robotdotnet/ntcore,333fred/ntcore,wpilibsuite/ntcore,robotdotnet/ntcore,333fred/ntcore,robotdotnet/ntcore,333fred/ntcore,333fred/ntcore,robotdotnet/ntcore