SDL2: build kmsdrm video driver on Linux

Primarily useful for kiosk builds and SBCs, but it usually ends up in the closure anyway.

pkgs/development/libraries/SDL2/default.nix

@@ -22,6 +22,9 @@
 , waylandSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid
 , wayland
 , wayland-protocols
+, drmSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid
+, libdrm
+, mesa
 , libxkbcommon
 , dbusSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid
 , dbus
@@ -92,7 +95,8 @@ stdenv.mkDerivation rec {
     ++ optional pulseaudioSupport libpulseaudio
     ++ optional udevSupport udev
     ++ optionals waylandSupport [ wayland wayland-protocols libxkbcommon ]
-    ++ optionals x11Support [ libICE libXi libXScrnSaver libXcursor libXinerama libXext libXrandr libXxf86vm ];
+    ++ optionals x11Support [ libICE libXi libXScrnSaver libXcursor libXinerama libXext libXrandr libXxf86vm ]
+    ++ optionals drmSupport [ libdrm mesa ];
 
   buildInputs = [ libiconv ]
     ++ dlopenBuildInputs