examples/simple: temp hack to get Zig build working

Still can't figure out this LazyPath dependency stuff. Very annoying.

examples/simple/build.zig

@@ -137,10 +137,10 @@ pub fn build(b: *std.Build) void {
 
     // For actually compiling the DTS into a DTB
     const dts_path = fmtPrint("board/{s}/linux.dts", .{ microkit_board });
+    const dtb_image_path = "linux.dtb";
     const dtc_command = b.addSystemCommand(&[_][]const u8{
-        "dtc", "-I", "dts", "-O", "dtb", dts_path, "-o"
+        "dtc", "-I", "dts", "-O", "dtb", dts_path, "-o", dtb_image_path
     });
-    const dtb_image_path = dtc_command.addOutputFileArg("linux.dtb");
 
     // Add microkit.h to be used by the API wrapper.
     exe.addIncludePath(.{ .path = sdk_board_include_dir });
@@ -167,14 +167,15 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
-    dtb_image_path.addStepDependencies(&guest_images.step);
+    // We need to produce the DTB from the DTS before doing anything to produce guest_images
+    guest_images.step.dependOn(&dtc_command.step);
 
     const linux_image_path = fmtPrint("board/{s}/linux", .{ microkit_board });
     const kernel_image_arg = fmtPrint("-DGUEST_KERNEL_IMAGE_PATH=\"{s}\"", .{ linux_image_path });
 
     const initrd_image_path = fmtPrint("board/{s}/rootfs.cpio.gz", .{ microkit_board });
     const initrd_image_arg = fmtPrint("-DGUEST_INITRD_IMAGE_PATH=\"{s}\"", .{ initrd_image_path });
-    const dtb_image_arg = fmtPrint("-DGUEST_DTB_IMAGE_PATH=\"{s}\"", .{ dtb_image_path.getPath(b) });
+    const dtb_image_arg = fmtPrint("-DGUEST_DTB_IMAGE_PATH=\"{s}\"", .{ dtb_image_path });
     guest_images.addCSourceFiles(&.{ libvmm_tools ++ "package_guest_images.S" }, &.{
         kernel_image_arg,
         dtb_image_arg,