Closes#11073
In the provided link, SWF params give up to 720P, and VideoConfig
gives 1080P for both best and bestvideo. I guess all Facebook videos
supports HTML5 now, so I remove the old detection for SWF params
The example in #10813 requires TV provider authentication in Firefox,
while youtube-dl can download it directly with an US proxy.
I'm not sure whether the mgid fix is cmt-specific or it applies to all
mtv-based sites. I keep it in cmt.py until similar patterns are found in
other websites.
I change the URL of the third test case, because now the original URL
does not contain a video anymore, and there's no easy to get the real
URL from the /film/ one.
Shell assignment operator in BSD make != is ported to GNU make in
version 4.0, so 3.x doesn't work. I choose to drop BSD make support as
installing GNU make on *BSD systems is easier than installing newer GNU
make.