Raise minimal required versions for OCaml and Coq (#203)

At least OCaml 4.05 is now required as well as Coq 8.8.

Author: bschommer

configure

@@ -530,14 +530,14 @@ missingtools=false
 echo "Testing Coq... " | tr -d '\n'
 coq_ver=$(${COQBIN}coqc -v 2>/dev/null | sed -n -e 's/The Coq Proof Assistant, version \([^ ]*\).*$/\1/p')
 case "$coq_ver" in
-  8.7.0|8.7.1|8.7.2|8.8.0|8.8.1|8.8.2|8.9.0|8.9.1|8.10.0|8.10.1)
+  8.8.0|8.8.1|8.8.2|8.9.0|8.9.1|8.10.0|8.10.1)
         echo "version $coq_ver -- good!";;
   ?*)
         echo "version $coq_ver -- UNSUPPORTED"
         if $ignore_coq_version; then
             echo "Warning: this version of Coq is unsupported, proceed at your own risks."
         else
-            echo "Error: CompCert requires one of the following Coq versions: 8.10.1, 8.10.0, 8.9.1, 8.9.0, 8.8.2, 8.8.1, 8.8.0, 8.7.2, 8.7.1, 8.7.0"
+            echo "Error: CompCert requires one of the following Coq versions: 8.10.1, 8.10.0, 8.9.1, 8.9.0, 8.8.2, 8.8.1, 8.8.0"
             missingtools=true
         fi;;
   "")
@@ -549,15 +549,10 @@ esac
 echo "Testing OCaml... " | tr -d '\n'
 ocaml_ver=`ocamlopt -version 2>/dev/null`
 case "$ocaml_ver" in
-  4.00.*|4.01.*)
+  4.00.*|4.01.*| 4.02.*|4.03.*|4.04.*)
         echo "version $ocaml_ver -- UNSUPPORTED"
-        echo "Error: CompCert requires OCaml version 4.02 or later."
+        echo "Error: CompCert requires OCaml version 4.05 or later."
         missingtools=true;;
-  4.02.*|4.03.*|4.04.*)
-      echo "version $ocaml_ver -- good!"
-      echo "WARNING: some Intel processors of the Skylake and Kaby Lake generations"
-      echo "have a hardware bug that can be triggered by this version of OCaml."
-      echo "To avoid this risk, it is recommended to use OCaml 4.05 or later.";;
   4.0*)
         echo "version $ocaml_ver -- good!";;
   ?.*)