Fix various warnings/errors
RPM build warnings:
Macro expanded in comment on line 16: %{_libdir}/ocaml/caml/config.h
File not found: /builddir/build/BUILDROOT/ocaml-gsl-1.19.1-41.fc37.x86_64/usr/lib64/ocaml/gsl/*.cmxs
RPM build errors:
File not found: /builddir/build/BUILDROOT/ocaml-gsl-1.19.1-41.fc37.x86_64/usr/lib64/ocaml/gsl/*.cmxs