Disable the generic extractor entirely

It can be used for SSRF attacks even when redirects are disabled

patches/youtube-dl-disable-generic.diff

@@ -0,0 +1,12 @@
+diff --git a/youtube_dl/extractor/__init__.py b/youtube_dl/extractor/__init__.py
+index 18d8dbcd6..4d3edfac3 100644
+--- a/youtube_dl/extractor/__init__.py
++++ b/youtube_dl/extractor/__init__.py
+@@ -13,7 +13,6 @@ except ImportError:
+         for name, klass in globals().items()
+         if name.endswith('IE') and name != 'GenericIE'
+     ]
+-    _ALL_CLASSES.append(GenericIE)
+ 
+ 
+ def gen_extractor_classes():