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gbddml 2.71.10 is not compatible with ocaml 5

```
=== ERROR while compiling gbddml.2.71.10 =====================================#
context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
path ~/.opam/5.0/.opam-switch/build/gbddml.2.71.10
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p gbddml -j 31
exit-code 1
env-file ~/.opam/log/gbddml-7-78ebeb.env
output-file ~/.opam/log/gbddml-7-78ebeb.out
File "lib/gbddml/dune", line 7, characters 37-45:
7 | (foreign_stubs (language c) (names gbdd_cml gbdd)
^^^^^^^^
(cd _build/default/lib/gbddml && /usr/bin/gcc -O2 -fno-strict-aliasing -fwrapv -pthread -fPIC -D_FILE_OFFSET_BITS=64 -x c++ -g -O2 -fno-operator-names -fPIC -g -I /home/opam/.opam/5.0/lib/ocaml -I /home/opam/.opam/5.0/lib/camlidl -o gbdd_cml.o -c gbdd_cml.c)
gbdd_cml.c: In function 'value alloc_gdbb_block()':
gbdd_cml.c:101:15: error: 'alloc_custom' was not declared in this scope; did you mean 'caml_alloc_custom'?
101 | value res = alloc_custom(
| ^~~~~~~~~~~~
| caml_alloc_custom
```

Signed-off-by: Marcello Seri <marcello.seri@gmail.com>

Changed files
+1 -1
packages
gbddml
gbddml.2.71.10
+1 -1
packages/gbddml/gbddml.2.71.10/opam
···
bug-reports:
"https://gricad-gitlab.univ-grenoble-alpes.fr/verimag/synchrone/lutin"
depends: [
-
"ocaml"
+
"ocaml" {< "5.0"}
"base-unix" {build}
"dune" {>= "2.0"}
"camlidl" {>= "1.09"}