Various fixes around pandoc

Stackage/Build.hs

@@ -27,7 +27,7 @@ defaultBuildSettings :: Maybe Int -- ^ argument to -j
 defaultBuildSettings cores version = BuildSettings
     { sandboxRoot = "sandbox"
     , expectedFailuresBuild = defaultExpectedFailures version
-    , extraArgs = \bs -> "-fnetwork23" :
+    , extraArgs = \bs -> "-fnetwork23" : "-fhttps" :
         case bs of
             BSTest -> []
             _ ->

Stackage/Config.hs

@@ -240,7 +240,7 @@ defaultStablePackages ghcVer requireHP = unPackageMap $ execWriter $ do
         , "compdata hybrid-vectors"
         , "executable-path formatting quandl-api"
         , "fgl hmatrix hmatrix-gsl"
-        , "alex happy"
+        , "alex happy c2hs"
         , "fpco-api"
         ]
     -- aws persistent-mongoDB
@@ -500,6 +500,9 @@ defaultStablePackages ghcVer requireHP = unPackageMap $ execWriter $ do
     -- https://github.com/fpco/stackage/issues/288
     addRange "Michael Snoyman" "text" "< 1.2"
 
+    -- Pandoc upper bound
+    addRange "Michael Snoyman" "http-client" "< 0.4"
+
     when (ghcVer == GhcMajorVersion 7 8 && requireHP) $ do
         -- Yay workarounds for unnecessarily old versions
         let peg x y = addRange "Haskell Platform" x y