haskell-opencv: fix build and #47595

The applied patch can be removed, when
cd613e200a
hits hackage and later nixpkgs.

Closes https://github.com/NixOS/nixpkgs/pull/50192.
Closes https://github.com/NixOS/nixpkgs/issues/47595.

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

@@ -251,6 +251,10 @@ self: super: {
   # Fails for non-obvious reasons while attempting to use doctest.
   search = dontCheck super.search;
 
+  # see https://github.com/LumiGuide/haskell-opencv/commit/cd613e200aa20887ded83256cf67d6903c207a60
+  opencv = dontCheck (appendPatch super.opencv ./patches/opencv-fix-116.patch);
+  opencv-extra = dontCheck (appendPatch super.opencv-extra ./patches/opencv-fix-116.patch);
+
   # https://github.com/ekmett/structures/issues/3
   structures = dontCheck super.structures;
 

pkgs/development/haskell-modules/patches/opencv-fix-116.patch

@@ -0,0 +1,11 @@
+diff -ur opencv-0.0.2.1.bak/Setup.hs opencv-0.0.2.1/Setup.hs
+--- opencv-0.0.2.1.bak/Setup.hs	2018-11-10 17:18:41.355731189 +0100
++++ opencv-0.0.2.1/Setup.hs	2018-11-10 17:18:56.901681162 +0100
+@@ -3,6 +3,6 @@
+ 
+ main = do
+     args <- getArgs
+-    let args' | "configure" `elem` args = args ++ ["--with-gcc","c++", "--with-ld","c++"]
++    let args' | "configure" `elem` args = args ++ ["--with-gcc","c++"]
+               | otherwise               = args
+     defaultMainArgs args'