curl: fix option listing in newer versions

_parse_help only takes a single parameter (which is then splits) for
the options that it invokes the tool with.

Author: algorythmic

completions/curl

@@ -159,7 +159,7 @@ _comp_cmd_curl()
     esac
 
     if [[ $cur == -* ]]; then
-        COMPREPLY=($(compgen -W '$(_parse_help "$1" --help all)' -- "$cur"))
+        COMPREPLY=($(compgen -W '$(_parse_help "$1" "--help all")' -- "$cur"))
         [[ ${COMPREPLY-} ]] ||
             COMPREPLY=($(compgen -W '$(_parse_help "$1")' -- "$cur"))
     fi