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ocaml5: restrict cairo2

It uses unprefixed API:

#=== ERROR while compiling cairo2.0.6.3 =======================================#
# 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/cairo2.0.6.3
# command ~/.opam/opam-init/hooks/sandbox.sh build dune runtest -p cairo2 -j 255
# exit-code 1
# env-file ~/.opam/log/cairo2-7-252ab9.env
# output-file ~/.opam/log/cairo2-7-252ab9.out
### output ###
# File "tests/dune", line 3, characters 21-31:
# 3 | (names image_create matrix_set surface_gc test_for_stream
# ^^^^^^^^^^
# (cd _build/default && /home/opam/.opam/5.0/bin/ocamlopt.opt -w -40 -g -o tests/matrix_set.exe src/cairo.cmxa -I src tests/.image_create.eobjs/native/matrix_set.cmx)
# /usr/bin/ld: src/libcairo_stubs.a(cairo_stubs.o): in function `caml_cairo_create':
# /home/opam/.opam/5.0/.opam-switch/build/cairo2.0.6.3/_build/default/src/cairo_stubs.c:53: undefined reference to `alloc_custom'

Changed files
+2 -2
packages
cairo2
cairo2.0.6.2
cairo2.0.6.3
+1 -1
packages/cairo2/cairo2.0.6.2/opam
···
["dune" "build" "@doc"] {with-doc}
]
depends: [
-
"ocaml" {>= "4.02"}
+
"ocaml" {>= "4.02" & < "5.0.0"}
"base-bigarray"
"dune"
"dune-configurator" {>= "1.11.4"}
+1 -1
packages/cairo2/cairo2.0.6.3/opam
···
["dune" "build" "@doc"] {with-doc}
]
depends: [
-
"ocaml" {>= "4.02"}
+
"ocaml" {>= "4.02" & < "5.0.0"}
"base-bigarray"
"dune" {>= "2.7.0"}
"dune-configurator" {>= "2.7.0"}