intel-gpu-tools: apply patch to fix a compile error

see https://bugs.gentoo.org/show_bug.cgi?id=548318

pkgs/development/tools/misc/intel-gpu-tools/default.nix

@@ -10,6 +10,8 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ pkgconfig libdrm libpciaccess cairo dri2proto udev libX11 libXext libXv libXrandr glib bison ];
 
+  patches = [ ./compile-fix.patch ];
+
   meta = with stdenv.lib; {
     homepage = https://01.org/linuxgraphics/;
     description = "Tools for development and testing of the Intel DRM driver";