Merge pull request ocaml#22676 from mseri/fix-camlbz2

camlbz2 is not compatible with ocaml 5

Author: mseri

packages/camlbz2/camlbz2.0.6.0/opam

@@ -13,7 +13,7 @@ build: [
   [make]
 ]
 depends: [
-  "ocaml"
+  "ocaml" {< "5.0"}
   "ocamlfind"
   "conf-libbz2"
 ]

packages/camlbz2/camlbz2.0.7.0/opam

@@ -15,7 +15,7 @@ build: [
   [make]
 ]
 depends: [
-  "ocaml"
+  "ocaml" {< "5.0"}
   "ocamlfind"
   "conf-autoconf"
   "conf-aclocal"