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alt-ergo <= 1.1 is not compatible with ocaml5

```
File "src/structures/ty.ml", line 178, characters 33-51:
178 | | Tvar{v=v1} , Tvar{v=v2} -> Pervasives.compare v1 v2
^^^^^^^^^^^^^^^^^^
Error: Unbound module Pervasives
```

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

Changed files
+7 -3
packages
alt-ergo
alt-ergo.0.95.2
alt-ergo.0.99.1
alt-ergo.1.01
+1 -1
packages/alt-ergo/alt-ergo.0.95.2/opam
···
]
depends: [
-
"ocaml"
"zarith"
"ocamlgraph" {>= "1.8.2"}
"num"
···
]
depends: [
+
"ocaml" {<"5.0"}
"zarith"
"ocamlgraph" {>= "1.8.2"}
"num"
+1 -1
packages/alt-ergo/alt-ergo.0.99.1/opam
···
]
depends: [
-
"ocaml"
"zarith"
"ocamlgraph" {>= "1.8.2"}
"num"
···
]
depends: [
+
"ocaml" {<"5.0"}
"zarith"
"ocamlgraph" {>= "1.8.2"}
"num"
+5 -1
packages/alt-ergo/alt-ergo.1.01/opam
···
["rm" "%{man}%/man1/alt-ergo.1"]
]
-
depends: ["ocaml" "zarith" "num"]
messages: [ "This release is too old. Please consider using version 1.30 that fixes many soundness bugs and brings a lot of improvements" ]
synopsis: "Alt-Ergo, an SMT Solver for Software Verification"
description: """
···
["rm" "%{man}%/man1/alt-ergo.1"]
]
+
depends: [
+
"ocaml" {<"5.0"}
+
"zarith"
+
"num"
+
]
messages: [ "This release is too old. Please consider using version 1.30 that fixes many soundness bugs and brings a lot of improvements" ]
synopsis: "Alt-Ergo, an SMT Solver for Software Verification"
description: """