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alt-ergo-free 2.2.0 is not compatible with ocaml5

```
File "/home/opam/.opam/5.0/.opam-switch/build/alt-ergo-free.2.2.0/lib/util/myUnix.ml", line 19, characters 7-22:
19 | if Pervasives.(<>) timelimit 0. then
^^^^^^^^^^^^^^^
Error: Unbound module Pervasives
```

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

Changed files
+1 -1
packages
alt-ergo-free
alt-ergo-free.2.2.0
+1 -1
packages/alt-ergo-free/alt-ergo-free.2.2.0/opam
···
]
depends: [
-
"ocaml" {>= "4.04.0"}
+
"ocaml" {>= "4.04.0" & < "5.0"}
"num"
"zarith" {>= "1.4"}
"camlzip"