[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Suppress rtprio warning when ${CI} env var is set (#279)

[akgrant43]

Hi Fabio,

I think using a CI environment variable to control the output of 
warnings is less than ideal:

- It is doing double duty with a variable, which is never a good idea.

- If I'm running a CI that does allow rtprio and I want the warning, I 
  have to write the non-obvious script to unset the environment 
  variable.

- If I'm running some other production environment and want to suppress 
  the warning I have to do something like:

export CI "this is a ugly hack to make smalltalk suppress one warning"
squeak/pharo some.image

Either of:

--suppress-rtprio-warning  # previously suggested

or

--suppress list,of,warnings

as command line options is a better approach.  We have CI specific 
scripts which can do the appropriate thing.


Cheers,
Alistair

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