Revert "glusterfs: also apply hack"

This reverts commit 8503e5613f.

pkgs/by-name/gl/glusterfs/package.nix

@@ -159,12 +159,6 @@ stdenv.mkDerivation rec {
     "--localstatedir=/var"
   ];
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   nativeBuildInputs = [
     autoconf
     automake