Clean up organization of package runtime

core/runtime/default_allocators.odin

@@ -15,7 +15,46 @@ when ODIN_DEFAULT_TO_NIL_ALLOCATOR || ODIN_OS == "freestanding" {
 			data = nil,
 		};
 	}
-} else when ODIN_OS != "windows" {
+
+} else when ODIN_OS == "windows" {
+	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) {
+		switch mode {
+		case .Alloc:
+			return _windows_default_alloc(size, alignment);
+
+		case .Free:
+			_windows_default_free(old_memory);
+
+		case .Free_All:
+			// NOTE(tetra): Do nothing.
+
+		case .Resize:
+			return _windows_default_resize(old_memory, old_size, size, alignment);
+
+		case .Query_Features:
+			set := (^Allocator_Mode_Set)(old_memory);
+			if set != nil {
+				set^ = {.Alloc, .Free, .Resize, .Query_Features};
+			}
+			return nil, nil;
+
+		case .Query_Info:
+			return nil, nil;
+		}
+
+		return nil, nil;
+	}
+
+	default_allocator :: proc() -> Allocator {
+		return Allocator{
+			procedure = default_allocator_proc,
+			data = nil,
+		};
+	}
+
+} else {
 	// TODO(bill): reimplement these procedures in the os_specific stuff
 	import "core:os"