friday-juicypixels: disable tests

the tarball from
https://hackage.haskell.org/package/friday-juicypixels-0.1.2/friday-juicypixels-0.1.2.tar.gz
does not include the test/rgba8.png file, which causes the test
code to fail

pkgs/development/haskell-modules/configuration-common.nix

@@ -282,6 +282,7 @@ self: super: {
   etcd = dontCheck super.etcd;
   fb = dontCheck super.fb;                              # needs credentials for Facebook
   fptest = dontCheck super.fptest;                      # http://hydra.cryp.to/build/499124/log/raw
+  friday-juicypixels = dontCheck super.friday-juicypixels; #tarball missing test/rgba8.png
   ghc-events = dontCheck super.ghc-events;              # http://hydra.cryp.to/build/498226/log/raw
   ghc-events-parallel = dontCheck super.ghc-events-parallel;    # http://hydra.cryp.to/build/496828/log/raw
   ghc-imported-from = dontCheck super.ghc-imported-from;