build: fix build

src/rtl/bst.zig

@@ -1,10 +1,10 @@
-const tagged_ptr = @import("tagged_ptr.zig");
+const rtl = @import("rtl");
 const std = @import("std");
 
 pub const Node = struct {
     left: *Node,
     right: *Node,
-    parent: tagged_ptr.TaggedPtr(Node),
+    parent: rtl.TaggedPtr(Node),
 };
 
 /// Base struct for binary search trees.

src/rtl/root.zig

@@ -8,6 +8,7 @@ pub const pairing_heap = @import("pairing_heap.zig");
 pub const PairingHeap = pairing_heap.PairingHeap;
 pub const TaggedPtr = @import("tagged_ptr.zig").TaggedPtr;
 pub const bst = @import("bst.zig");
+pub const BST = bst.BST;
 
 test {
     std.testing.refAllDecls(@This());