Add check to removal of link to share

ghcup

@@ -1657,8 +1657,10 @@ rm_ghc() {
                 fi
             done
             unset t known_tools
-            # remove share directory
+            # remove dangling symlink to share directory
+            if [ -h "${BIN_LOCATION}/../share" ] && [ ! -e "${BIN_LOCATION}/../share" ] ; then
                 edo rm "${BIN_LOCATION}/../share"
+            fi
 
             warning_message "Done."
             warning_message "You may now want to set currently active GHC to a different version via:"