emulationstation: pin boost 1.69

Anything later causes build failures.

pkgs/applications/emulators/emulationstation/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, pkg-config, cmake, curl, boost, eigen
+{ lib, stdenv, fetchFromGitHub, pkg-config, cmake, curl, boost169, eigen
 , freeimage, freetype, libGLU, libGL, SDL2, alsa-lib, libarchive
 , fetchpatch }:
 
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
   ];
 
   nativeBuildInputs = [ pkg-config cmake ];
-  buildInputs = [ alsa-lib boost curl eigen freeimage freetype libarchive libGLU libGL SDL2 ];
+  buildInputs = [ alsa-lib boost169 curl eigen freeimage freetype libarchive libGLU libGL SDL2 ];
 
   installPhase = ''
     install -D ../emulationstation $out/bin/emulationstation