[ocaml-menhir] More aggressive autobuild trigger when ocaml is updated

[yuyichao]

The update from ocaml 5.1.0 to 5.1.1 causes the build of herdtools7-git to fail with error:

Error: Files /usr/lib/ocaml/menhirLib/menhirLib.cmxa and /usr/lib/ocaml/stdlib.cmxa make inconsistent assumptions over implementation Stdlib__Sys

AFAICT, this is caused by changes/recompilation of the standard library and is fixed by recompiling menhir.

It seems that just triggering rebuild on minor version update is not enough. I don't know if triggering on pkgrel update is necessary but it's included here just to be safe.

This may need to be applied to other ocaml packages.