Revert "mate.eom: Apply hack for GCC symlink changes" (#389262)

pkgs/desktops/mate/eom/default.nix

···
     hicolor-icon-theme
   ];
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace-warn 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   enableParallelBuilding = true;
 
   passthru.updateScript = mateUpdateScript { inherit pname; };