bug#34294: 27.0.50; flymake-start-on-save-buffer has no effect

[Juri Linkov]

>> Anyway, your initiative got my attention.  Do you remember what I
>> wrote previously?
>>
>>> [jt] I would even go as far as obsoleting the variable entirely, and
>>> use make-obsolete-variable instead: there's no real reason
>>> why newline should be given special treatment.  And users
>>> that need this for some obscure reason can probably plug it
>>> in post-self-insert-hook.
>>
>>> If you obsolete the variable, you can remove it from the
>>> manual, too.
>>
>> I still think this is the best option, so if you didn't already push that,
>> I would be thankful that you do. It should solve your issue and make
>> the code and manual simpler.
>
> I had doubts about removing it, but since you are sure about this,
> then please see the following patch attached.  If basically this is ok,
> I'll also change the manual, NEWS, etc.

Now the variable is obsoleted in master.