curl: add --remove-on-error

If a transfer returns an error, using this option makes curl remove the
leftover downloded (partial) local file before exiting.

Added test 376 to verify

Closes #8503

src/tool_listhelp.c

@@ -574,6 +574,9 @@ const struct helptxt helptext[] = {
   {"-R, --remote-time",
    "Set the remote file's time on the local output",
    CURLHELP_OUTPUT},
+  {"    --remove-on-error",
+   "Remove output file on errors",
+   CURLHELP_CURL},
   {"-X, --request <method>",
    "Specify request method to use",
    CURLHELP_CONNECTION},