VPN-6766 - Android Qt 6.9

[mcleinman]

While this builds on my machine™️, I haven't done the work to make TaskCluster happy. More worrisome, there is a runtime crash on launch, occuring as soon as something C++ tries to grab the Android context. I'm going to put this down for a bit and come back to it, but for posterity:

Yet to do

• Get it working without runtime errors
• Set this up as qt-next on taskcluster, keep prior and subsequent Android build around

Thoughts

• Can I get rid of the qtbindings module and see what happens, since the actual Qt stuff should be coming in via other means?
• Drastic, but I could just reduce the number of Android modules. Would that help?

A partial list of things I've tried, but didn't fix the run time crash:
- [ ] Tried a new class like AppContextHolder (different one for both daemon and main app), and getting that initialized first, before anything else. That didn’t help.
- [ ] Tried expiclity adding Qt::Core to src/CmakeLists.txt with the other ones - didn’t help
- [ ] I checked the combined manifest file. It was being combined just fine.
- [ ] In VPNActivity.java, confirmed the onCreate activity was the same one being used in onResume via System.identityHashCode(this), and so we weren’t accidentally creating a new one each time or something
- [ ] Changed android:launchmode in Manifest file from “singleTop” to “singleTask”
- [ ] Added in PRE_LINK into the ndk_openssl_merged command in android_openssl.cmake - didn’t help
- [ ] Commenting out QNetworkInformation::loadDefaultBackend(); gets it a little bit further than otherwise, but only because it skips what the first crash would be.
- [ ] Commented out removeUnusedEntriesAfterDays = 30 (from android/settings.gradle). Don’t remember why - maybe there was a warning?
- [ ] Removing RESOURCE_PREFIX /qt/qml from src/ui/CMakeLists.txt, as there is a comment about removing that once we only compile with it
- [ ] Android/common/build.gradle has 2 entries under dependencies of implementation project(path: ':qtBindings’). Removing one of them doesn’t change anything.
- [ ] Added implementation fileTree(dir: '../libs', include: ['*.jar', '*.aar’]) under dependencies in android/common/build.gradle (Why? Probably something I saw online. Don’t remember.)
- [ ] Including repositories { flatDir { dirs($rootDir/libs) } } in android/common/build.gradle and android/vpnClient/build.gradle
- [ ] Using a namespace of 'org.mozilla.firefox.vpn' for vpnClient
- [ ] Upping the compileSdkVersion and targetSdkVersion to 35 (and making a few other small adjustments so things compile), and seeing if that fixes everything (it doesn’t)
- [ ] I believe we shouldn’t be using QtApplicationBase/QtActivityBase - should use the derived class (in my PR)
- [ ] ClientCommon was never used and was throwing warnings, so I removed it

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Description

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Reference

i.e Jira or Github issue URL

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[hneiva]

changes under taskcluster/ LGTM