iOS: Unnecessary logging on every pulse when GL context changes

On iOS, this is logged to the console whenever the GL context is cleared, regardless the value of PrismSettings.verbose, on every single pulse:

IOSWindowSystemInterface : setSwapInterval unimp
setSwapInterval(0)
...
IOSWindowSystemInterface : setSwapInterval unimp
setSwapInterval(1)

These messages should be printed out only if PrismSettings.verbose is true (this will require passing that value to native, or defining a directive like LOG_GL) or not printed at all (like on Mac OS).