Latest SDL2 might crash SF2 in e.g. Windows 7

[Chordian]

Sourcë Gårrett in the Facebook group had his SF2 crashing in Windows 7. I tried SF2 in another Windows 7 with the same screen resolution as his, so it isn't a general problem.

However, Sourcë later found out that it was the SDL2.dll in build 20200718 that crashed SF2. He tried replacing it with an older, more stable 32-bit version from libsdl.org, and then SF2 worked fine on his computer.

[Chordian]

This is a task migrated from workstreams in Slack.

[Chordian]

I later added an entry in the faq.txt file about it.