[Clang] Remove some deprecated warnings

[troopa81]

Because either

• non working Q_NOWARN_DEPRECATED_PUSH/POP in recent clang versions
• newly deprecated 3d classes
• Indirect used of Qt 3d deprecated classes

[github-actions]

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[nyalldawson]

Does this hide a deprecation warning from qt? If so, I think we shouldn't do that...

[troopa81]

Does this hide a deprecation warning from qt? If so, I think we shouldn't do that...

for qgsmaskpaintengine this looks like a weird clang issue/limitation, and I fail to find a way to fix it

for 3D yes. What's the policy here ? Shall we disable warnings on deprecated, which could potentially lead to adding other deprecated call to the code waiting for someone to migrate to the new API ? or Shall we add Q_PUSH_NO_WARN macro and forget that we are using a deprecated API ?

[nyalldawson]

What's the policy here ?

Leave the warning in place, or replace the deprecated method. Otherwise the future qt6 port will be a pain 🤪

[troopa81]

Leave the warning in place,

OK, I removed 3d fix that would require to be fixed later

[nyalldawson]

@troopa81 I propose an alternative in #60470 -- I think it's preferable because it avoids adding extra complexity to the cmake files.

[troopa81]

@nyalldawson OK, I removed it from this PR to keep only the openCL thing