Fix compilation with DMD v2.112.0

SMILEBASIC/console.d

@@ -4,6 +4,7 @@ import derelict.sdl2.image;
 import derelict.opengl3.gl;
 import otya.smilebasic.petitcomputer;
 import std.string;
+import undead.string;
 import std.stdio;
 import std.file;
 import std.conv;