1caf26737b55ead61cd2b4f744f28d6c259b84e4
widevine currenty uses `use_source_config_var` and product variables to ensure that products gets the correct selection of source or prebuilts of widevine apex. `use_source_config_var` is being deprecated from Soong to unfiy the mechanisms for source vs prebuilt selection. This CL transitions widevine to a different mechanism `prefer` for prebuilt selection to aid the deprecation. Test: lunch cf_x86_64_phone-trunk_staging-userdebug; m nothing; aninja -t path droid vendor/widevine/libwvdrmengine/apex/prebuilt/com.google.android.widevine.nonupdatable.apks; // no path exists, i.e. uses source Test: lunch osprey-trunk_staging-userdebug; m nothing; aninja -t path droid vendor/widevine/libwvdrmengine/apex/prebuilt/com.google.android.widevine.nonupdatable.apks; // path exists; i.e. uses prebuilts Bug: 332379718 Change-Id: I78800aee49f1de83ea2ce8160923362871806d87
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