Disable Coq 8.7.2 also in CI scripts

scripts/ci-coq.sh

@@ -3,18 +3,18 @@
 
 cd ./coq
 
-opam switch coq8.7.2
-eval `opam config env`
-./configure_coq.sh
-make -j
+#opam switch coq8.7.2
+#eval `opam config env`
+#./configure_coq.sh
+#make -j
 
-if [[ "$?" != "0" ]];
-then
-    echo "Compilation with Coq 8.7.2 failed"
-    exit 1
-fi
+#if [[ "$?" != "0" ]];
+#then
+#    echo "Compilation with Coq 8.7.2 failed"
+#    exit 1
+#fi
 
-make clean
+#make clean
 
 opam switch coq8.8
 eval `opam config env`