Correctly support -default-to-nil-allocator for all platforms

core/runtime/default_allocators_general.odin

@@ -5,19 +5,8 @@ package runtime
 
 when ODIN_DEFAULT_TO_NIL_ALLOCATOR {
 	// mem.nil_allocator reimplementation
-
-	default_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
-	                               size, alignment: int,
-	                               old_memory: rawptr, old_size: int, loc := #caller_location) -> ([]byte, Allocator_Error) {
-		return nil, .None
-	}
-
-	default_allocator :: proc() -> Allocator {
-		return Allocator{
-			procedure = default_allocator_proc,
-			data = nil,
-		}
-	}
+	default_allocator_proc :: nil_allocator_proc
+	default_allocator :: nil_allocator
 } else {
 	// TODO(bill): reimplement these procedures in the os_specific stuff
 	import "core:os"