mac: avoid unnecessary unsafe conversions; fixes crash in debug builds

Previously, running a debug build of mpv would crash with this output
when preinit() at vo_libmpv.c:732 calls control(vo, VOCTRL_PREINIT, NULL):

Swift/Optional.swift:247: Fatal error: unsafelyUnwrapped of nil optional

This comes from this line of code:

var data = UnsafeMutableRawPointer.init(bitPattern: 0).unsafelyUnwrapped

Unsafely unwrapping a UnsafeMutableRawPointer.init has always been UB,
but the Swift runtime began asserting on it in debug builds a couple macOS
versions ago.

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