garrigue/lablgtk

lablgtk 2.18.12 build failure against ocaml 5.0.0

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while trying to ocaml to 5.0.0, found an issue while regression build lablgtk 2.18.12

/Applications/Xcode.app/Contents/Developer/usr/bin/make -C src world
ocamlc.opt   -w s-3+52 -c  varcc.ml
File "varcc.ml", line 26, characters 27-41:
26 |         Buffer.add_char b (Char.lowercase id.[i])
                                ^^^^^^^^^^^^^^
Error: Unbound value Char.lowercase

Lablgtk 2.18.13 has been released in October 2022 to fix this problem and a few others.