[PATCH v2 8/8] Add maint set/show enable-threads

[Tom Tromey]

>> +maint set enable-threads
>> +maint show enable-threads
>> +  Control whether GDB can use threads.  The default is "on".

Eli> I'd suggest to say what will threads be used for.

In NEWS I guess it's ok, but elsewhere I'd prefer to be a bit vague
about the precise use of threads.  That way the documentation won't go
stale if we add more uses.

Tom