Bilibili now uses emscripten, which is very difficult for reverse
engineering. I don't expect it to be fixed in near future, so I mark
it as broken.
Ref: #10375
All starts from #10363. The test case in mtvservices:embedded uses
config.xml, while the video from #10363 and the test case in generic.py
is broken. Both uses index.html for fetching the feed URL.