Issue:

Given

• host CMake Qt build with zstd support and
• an Android target Cmake Qt build without zstd support

When

• building an application for Android with CMake

Then

• androiddeployqt will run rcc with default compression options to generate android_rcc_bundle.rcc, which means zstd and
• the resulting Android app will try to load the the assets with QResource::registerResource (in androidjnimain.cpp), which
• will silently fail as the compression flag indicates an unsupported scheme.
• leading finally to a hard-to-debug application failure if the files in android_rcc_bundle.rcc were needed.

Tasks:

• androiddeployqt should call rcc with a compression scheme supported by the target
• androidjnimain.cpp should issue a critical warning if registerResource fails
• QResource::registerResource should ideally have an overload which returns a "reason enum" indicating why it failed.