Revert "haskell generic-builder: fix Darwin regression for lmdb"

This reverts commit 8c58c44aaed3c05f817de9f0bf151bd927cb1abd.

This causes a mass rebuild and should go to staging instead before
master

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

@@ -384,7 +384,7 @@ stdenv.mkDerivation ({
     done
 
     for d in $(grep '^dynamic-library-dirs:' "$packageConfDir"/* | cut -d' ' -f2- | tr ' ' '\n' | sort -u); do
-      for lib in "$d/"*.{dylib,so}; do
+      for lib in "$d/"*.dylib; do
         ln -s "$lib" "$dynamicLinksDir"
       done
     done