wlroots: fix build

add missing header that changed in mesa-19.2.2

pkgs/development/libraries/wlroots/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, meson, ninja, pkgconfig
+{ stdenv, fetchFromGitHub, meson, ninja, pkgconfig, fetchpatch
 , wayland, libGL, wayland-protocols, libinput, libxkbcommon, pixman
 , xcbutilwm, libX11, libcap, xcbutilimage, xcbutilerrors, mesa
 , libpng, ffmpeg_4, freerdp
@@ -15,6 +15,15 @@ stdenv.mkDerivation rec {
     sha256 = "1ak86kx617c81dy85wg9rldy1z3n8ch93cjc05a4j6sifv0nkyfm";
   };
 
+  patches = [
+    # add missing header that changed in mesa-19.2.2
+    # https://github.com/swaywm/wlroots/issues/1862
+    (fetchpatch {
+      url = "https://github.com/swaywm/wlroots/commit/d113e48a2a32542fe6e12f1759f07888364609bf.diff";
+      sha256 = "1h09j1gmnzlz4py92a92chgy8xzsd8h8xn5irq9s2hq4cla66h87";
+    })
+  ];
+
   # $out for the library and $examples for the example programs (in examples):
   outputs = [ "out" "examples" ];