gamemode: Apply fixes from the unstable upstream

packages/gamemode/default.nix

@@ -1,6 +1,6 @@
 { stdenv, lib,
   meson, ninja, dbus, systemd, pkgconfig, cmake, inih,
-  fetchFromGitHub }:
+  fetchFromGitHub, fetchpatch }:
 
 stdenv.mkDerivation rec {
   pname = "gamemode";
@@ -13,6 +13,14 @@ stdenv.mkDerivation rec {
     sha256 = "17dck7dzkmzq52f2yrs930fdg2inr7nipvnwpd0jqrwgk2fhwk9z";
   };
 
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/FeralInteractive/gamemode/commit/be44b7091baa33be6dda60392e4c06c2f398ee72.patch";
+      sha256 = "TlDUETs4+N3pvrVd0FQGlGmC+6ByhJ2E7gKXa7suBtE=";
+    })
+    ./preload-nix-workaround.patch
+  ];
+  
   nativeBuildInputs = [
     meson ninja pkgconfig cmake
   ];
@@ -21,7 +29,16 @@ stdenv.mkDerivation rec {
     dbus systemd inih
   ];
 
-  mesonFlags = [ "-Dwith-systemd-user-unit-dir=${placeholder "out"}/lib/systemd/user" ];
+  mesonFlags = [
+    "-Dwith-systemd-user-unit-dir=${placeholder "out"}/lib/systemd/user"
+  ];
+
+  postPatch = ''
+    substituteInPlace data/gamemoderun \
+      --subst-var-by libraryPath ${lib.makeLibraryPath ([
+        (placeholder "lib")
+      ])}
+  '';
   
   meta = with lib; {
     description = "Optimise Linux system performance on demand";

packages/gamemode/preload-nix-workaround.patch

@@ -0,0 +1,12 @@
+diff --git a/data/gamemoderun b/data/gamemoderun
+index 573b3e4..6f2799e 100755
+--- a/data/gamemoderun
++++ b/data/gamemoderun
+@@ -5,5 +5,6 @@ GAMEMODEAUTO_NAME="libgamemodeauto.so.0"
+ 
+ # ld will find the right path to load the library, including for 32-bit apps.
+ LD_PRELOAD="${GAMEMODEAUTO_NAME}${LD_PRELOAD:+:$LD_PRELOAD}"
++LD_LIBRARY_PATH="@libraryPath@${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+ 
+-exec env LD_PRELOAD="${LD_PRELOAD}" $GAMEMODERUNEXEC "$@"
++exec env LD_PRELOAD="${LD_PRELOAD}" LD_LIBRARY_PATH="${LD_LIBRARY_PATH}" $GAMEMODERUNEXEC "$@"