kaputt 1.2 is not compatible with ocaml 5
Uses String.capitalize
```
=== ERROR while compiling kaputt.1.2 =========================================#
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/kaputt.1.2
command ~/.opam/opam-init/hooks/sandbox.sh build make all
exit-code 2
env-file ~/.opam/log/kaputt-7-7bbca6.env
output-file ~/.opam/log/kaputt-7-7bbca6.out
echo 'kaputt.cma' > kaputt.itarget
if [ -x "/home/opam/.opam/5.0/bin/ocamlopt" ]; then \
echo 'kaputt.cmxa' >> kaputt.itarget; \
else \
(test -x /home/opam/.opam/5.0/bin/ocamlopt && echo 'kaputt.cmxa' >> kaputt.itarget) || true; \
fi
(test -x /home/opam/.opam/5.0/bin/ocamljava && echo 'kaputt.cmja' >> kaputt.itarget) || true
/home/opam/.opam/5.0/bin/ocamlbuild -classic-display -no-links kaputt.otarget
/home/opam/.opam/5.0/bin/ocamlopt.opt unix.cmxa -I /home/opam/.opam/5.0/lib/ocamlbuild /home/opam/.opam/5.0/lib/ocamlbuild/ocamlbuildlib.cmxa myocamlbuild.ml /home/opam/.opam/5.0/lib/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
+ /home/opam/.opam/5.0/bin/ocamlopt.opt unix.cmxa -I /home/opam/.opam/5.0/lib/ocamlbuild /home/opam/.opam/5.0/lib/ocamlbuild/ocamlbuildlib.cmxa myocamlbuild.ml /home/opam/.opam/5.0/lib/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
File "myocamlbuild.ml", line 38, characters 25-42:
38 | let modulename = String.capitalize modulename in
^^^^^^^^^^^^^^^^^
Error: Unbound value String.capitalize
Command exited with code 2.
make: *** [Makefile:53: all] Error 10
```
Signed-off-by: Marcello Seri <marcello.seri@gmail.com>