gtk4-layer-shell: reenable ubsan

pkg/gtk4-layer-shell/build.zig

@@ -120,16 +120,6 @@ fn buildLib(b: *std.Build, module: *std.Build.Module, options: anytype) !*std.Bu
             b.fmt("-DGTK_LAYER_SHELL_MAJOR={}", .{lib_version.major}),
             b.fmt("-DGTK_LAYER_SHELL_MINOR={}", .{lib_version.minor}),
             b.fmt("-DGTK_LAYER_SHELL_MICRO={}", .{lib_version.patch}),
-
-            // Zig 0.14 regression: this is required because building with
-            // ubsan results in unknown symbols. Bundling the ubsan/compiler
-            // RT doesn't help. I'm not sure what the root cause is but I
-            // suspect its related to this:
-            // https://github.com/ziglang/zig/issues/23052
-            //
-            // We can remove this in the future for Zig updates and see
-            // if our binaries run in debug on NixOS.
-            "-fno-sanitize=undefined",
         },
     });