Also, m3u8_url extraction should be fatal as all formats depends
directly or indirectly on it.
This change fixes test_Generic_26 and TestFunnyOrDieSubtitles
'make lazy-extractors' creates the youtube_dl/extractor/lazy_extractors.py (imported by youtube_dl/extractor/__init__.py), which contains simplified classes that only have the 'suitable' class method and that load the appropiate class with the '__new__' method when a instance is created.