haskell generic-builder: fix Darwin regression for lmdb

Recent updates to the generic builder have caused haskellPackages.lmdb-simple to
fail to build on Darwin, since it cannot see the lmdb C dynamic library included
by its dependent haskellPackages.lmdb.

The C dynamic library has suffix `.so` not `.dylib`, so this fix allows for
that.

Closes #80190, but that issue may identify a preferable solution.

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 "$d/"*.dylib; do
+      for lib in "$d/"*.{dylib,so}; do
         ln -s "$lib" "$dynamicLinksDir"
       done
     done