glulxe: add livecheck

By default, livecheck isn't able to check the `stable` URL for
`glulxe`, so it falls back to checking the Git tags from the `head`
URL. This adds a `livecheck` block that checks the homepage, which
links to the `stable` tarball. The tarball filename uses a dotless
version, so this matches the version from the "Glulxe 1.2.3" inner
text of the link.

Formula/g/glulxe.rb

@@ -7,6 +7,11 @@ class Glulxe < Formula
   license "MIT"
   head "https://github.com/erkyrath/glulxe.git", branch: "master"
 
+  livecheck do
+    url :homepage
+    regex(/href=.*?glulxe[._-]v?\d+(?:\.\d+)*\.t[^>]+?>\s*Glulxe\s+v?(\d+(?:\.\d+)+)\s*</im)
+  end
+
   bottle do
     sha256 cellar: :any_skip_relocation, arm64_sequoia:  "bdc5dcc5eba9d4e5417b56c4cdee27958bd6ba76e5cecc60e46fff7aa4b754ef"
     sha256 cellar: :any_skip_relocation, arm64_sonoma:   "6605dc4b713cf75ff1e2082b4e515bbb3ec36dbb2846da6786538e1449fcef8b"