alttab: fix gcc-15 build

Without the change the build fails on `master` as
https://hydra.nixos.org/build/317969520:

    alttab.c:536:25: error: too many arguments to function 'getOffendingModifiersMask'; expected 0, have 1
      536 |     g.ignored_modmask = getOffendingModifiersMask(dpy); // or 0 for g.debug
          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~ ~~~

Author: trofi

pkgs/by-name/al/alttab/package.nix

@@ -3,6 +3,7 @@
   stdenv,
   coreutils,
   fetchFromGitHub,
+  fetchpatch,
   autoconf,
   automake,
   pkg-config,
@@ -28,6 +29,15 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-1+hk0OeSriXPyefv3wOgeiW781PL4VP5Luvt+RS5jmg=";
   };
 
+  patches = [
+    # Fix gcc-15 build failure: https://github.com/sagb/alttab/pull/178
+    (fetchpatch {
+      name = "gcc-15.patch";
+      url = "https://github.com/sagb/alttab/commit/665e3e369f74ab0075c22a46a3cb3a9f76bdd762.patch";
+      hash = "sha256-7l74kXs0bAyozBbgOEzDSY+4NE2pjdVfWda0XiPvCz4=";
+    })
+  ];
+
   nativeBuildInputs = [
     autoconf
     automake