ghcjs: update and fix ghcjs/reflex libs

Set dontStrip when building ghcjs libs, which fixes the ghcjs-dom lib
and also makes the logs cleaner.

pkgs/development/haskell-modules/generic-builder.nix

@@ -3,6 +3,7 @@
 }:
 
 { pname
+, dontStrip ? (ghc.isGhcjs or false)
 , version, revision ? null
 , sha256 ? null
 , src ? fetchurl { url = "mirror://hackage/${pname}-${version}.tar.gz"; inherit sha256; }
@@ -312,5 +313,6 @@ stdenv.mkDerivation ({
 // optionalAttrs (postInstall != "")    { inherit postInstall; }
 // optionalAttrs (preFixup != "")       { inherit preFixup; }
 // optionalAttrs (postFixup != "")      { inherit postFixup; }
+// optionalAttrs (dontStrip)            { inherit dontStrip; }
 // optionalAttrs (stdenv.isLinux)       { LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive"; }
 )