Merge pull request #289293 from b-rodrigues/fix_vdiffr

rPackages.vdiffr: fixed build

pkgs/development/r-modules/default.nix

@@ -452,6 +452,7 @@ let
     topicmodels = [ pkgs.gsl ];
     udunits2 = with pkgs; [ udunits expat ];
     units = [ pkgs.udunits ];
+    vdiffr = [ pkgs.libpng.dev ];
     V8 = [ pkgs.v8 ];
     XBRL = with pkgs; [ zlib libxml2.dev ];
     XLConnect = [ pkgs.jdk ];