hdr-plus: fix build on darwin

pkgs/applications/graphics/hdr-plus/default.nix

···
     })
   ];
 
+  postPatch = ''
+    sed -i '2a #include <array>' src/InputSource.h
+  '';
+
   nativeBuildInputs = [ cmake ];
 
   buildInputs = [ halide libpng libjpeg libtiff libraw ];