Enable --debugger-stop with -X

[duncan-roe]

Without this patch, --debugger-stop is ignored when -X is specified.

[duncan-roe]

Hi Rocky,

Thought I'd keep this functional change separate from the doco.
With git diff -w you can see it's really tiny.
Without this patch, --debugger-stop is ignored when -X is specified. I would like to document that -X is the same as --debugger-stop=full but it's not the same if it stops other --debugger-stop arguments from being actioned. And you can normally give --debugger-stop multiple times.

Cheers ... Duncan.

[rocky]

LGTM. Sorry I didn't see this before. (Sysadmin saying: never ascribe to maliciousness that which can be easier explained by oversight)