discord: fix runtime linking

(cherry picked from commit c5bed409b29dfbf467a71fab9679cf189ccfa428)

pkgs/applications/networking/instant-messengers/discord/base.nix

@@ -23,7 +23,7 @@ in stdenv.mkDerivation rec {
     libXScrnSaver
     libXtst
     libxcb
-    mesa.drivers
+    mesa
     nss
     wrapGAppsHook
   ];
@@ -31,7 +31,7 @@ in stdenv.mkDerivation rec {
   dontWrapGApps = true;
 
   libPath = lib.makeLibraryPath [
-    libcxx systemd libpulseaudio
+    libcxx systemd libpulseaudio libdrm mesa
     stdenv.cc.cc alsaLib atk at-spi2-atk at-spi2-core cairo cups dbus expat fontconfig freetype
     gdk-pixbuf glib gtk3 libnotify libX11 libXcomposite libuuid
     libXcursor libXdamage libXext libXfixes libXi libXrandr libXrender
@@ -50,7 +50,7 @@ in stdenv.mkDerivation rec {
     wrapProgram $out/opt/${binaryName}/${binaryName} \
         "''${gappsWrapperArgs[@]}" \
         --prefix XDG_DATA_DIRS : "${gtk3}/share/gsettings-schemas/${gtk3.name}/" \
-        --prefix LD_LIBRARY_PATH : ${libPath}
+        --prefix LD_LIBRARY_PATH : ${libPath}:$out/opt/${binaryName}
 
     ln -s $out/opt/${binaryName}/${binaryName} $out/bin/
     ln -s $out/opt/${binaryName}/discord.png $out/share/pixmaps/${pname}.png