starspace: mark broken

THe build fails against `zlib-1.3` in `master` as
https://hydra.nixos.org/build/249158742:

3rdparty/zlib.h:1468:32: error: expected initializer before 'Z_ARG'
1468 | ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
| ^~~~~

The upstream repository did not see updates for past 5 years and is
archived. Let's schedule it for removal.

pkgs/applications/science/machine-learning/starspace/default.nix

···
   '';
 
   meta = with lib; {
+    # Does not build against gcc-13. No development activity upstream
+    # for past few years.
+    broken = true;
     description = "General-purpose neural model for efficient learning of entity embeddings";
     homepage = "https://ai.facebook.com/tools/starspace/";
     license = licenses.mit;