Suppress spurious compiler warnings on first import of omas

[hassec]

On first import of omas, the compilation of the cython extensions will dump a ton of warnings.
See e.g.:

And this continues for O(100) lines. IMHO this is quite confusing for new users.

It would be nice if there was a way to suppress these or even better build extensions as part of the packaging to in addition to avoiding these warnings, one also avoids the slowdown on the first import.

[github-actions]

Stale issue message

[hassec]

The stale issue bot is a bit too quick to close issues IMHO...

@orso82 could you reopen?

[hassec]

@jmcclena @AreWeDreaming @torrinba could one of you reopen this issue?

[github-actions]

This issue has not seen any activity in the past 60 days. It is now marked as stale and will be closed in 7 days if no further activity is registered.

[hassec]

@orso82 could we mark this as bug so it doesn't get closed by the stale bot?

[orso82]

sure, go for it!

[hassec]

I do not have the rights to do that 😁