permanently_disable_interrupts shouldn't be unsafe.

[todo]

disabling interrupts doesn't break any safety guidelines, and is perfectly safe as far as rustc is concerned.

---

SunriseOS/kernel/src/panic.rs

Lines 64 to 68 in 7333eaf

	// todo: permanently_disable_interrupts shouldn't be unsafe.
	// body: disabling interrupts doesn't break any safety guidelines, and is perfectly safe as far as rustc is concerned.
	// Disable interrupts forever!
	unsafe { sync::permanently_disable_interrupts(); }
	// Don't deadlock in the logger

---

This issue was generated by todo based on a todo comment in 7333eaf when #415 was merged. cc @Orycterope.