[opam] update compatible versions in depends

opam/opam

@@ -102,13 +102,13 @@ run-test: [
 ]
 
 depends: [
-  "ocaml" { >= "4.05.0" & ( < "4.08.0~" | >= "4.08.1" ) }
+  "ocaml" { >= "4.08.1" }
   "ocamlgraph" { >= "1.8.8" & < "1.9~" }
   "ocamlfind" # needed beyond build stage, used by -load-module
   "zarith"
   "conf-autoconf" { build }
-  ( ( "lablgtk" { >= "2.18.2" } & "conf-gnomecanvas" & "conf-gtksourceview" )
-    | ( "lablgtk3" { >= "3.0.beta4" & os!="macos" }
+  ( ( "lablgtk" { >= "2.18.8" } & "conf-gnomecanvas" & "conf-gtksourceview" )
+    | ( "lablgtk3" { >= "3.1.0" & os!="macos" }
         & "lablgtk3-sourceview3" & "conf-gtksourceview3" ) )
   ( "alt-ergo-free" | "alt-ergo" )
   "conf-graphviz" { post }
@@ -128,18 +128,9 @@ depopts: [
   "ppx_deriving_yojson"
 ]
 
-conflicts: [
-  "lablgtk" { < "2.18.2" } #for ocaml >= 4.02.1
-  "frama-c-e-acsl" #avoid mixing old releases of E-ACSL, it is already
-                   #distributed with this version of Frama-C
-  "frama-c-base"   #avoid mixing old releases of Frama-C, now that only the
-                   #'frama-c' package exists
-]
-
 messages: [
   "The Frama-C/Wp now uses Why-3 for all provers (Cf. deprecated -wp-prover native:alt-ergo)"
   {alt-ergo:installed}
   "The Frama-C/Wp native support for Coq is now deprecated (use TIP or Why-3 instead)."
   {coq:installed}
-  "WARNING: There is a known issue with OCaml 4.05.0 and ocamlfind 1.8.1 (https://github.com/ocaml/opam-repository/issues/10925) when upgrading from a previous ocamlfind. If the compilation of Frama-C fails, try downgrading ocamlfind to 1.8.0 or upgrading OCaml to > 4.05.0." { ocaml:version = "4.05.0" & ocamlfind:version = "1.8.1" }
 ]