It seems like GitHub badges have some caching issues and they do not
work correctly (I have them showing two contradictory statuses,
depending on tab, no matter if I reload page or not).
This badge is useful link straight to the Coverity report, but Coverity
decides to present the scan results in quite misleading way - mixing
runs from master with runs from other branches.
It's better to show no info at all than to show misleading info.
Link to Coverity scan is accessible in README.md, as a reference [3] in
the comparison table.
Previous glyph (Five Spoked Asterisk) looks great on Linux, but as it
turns out seems to be broken everywhere else. Use this opportunity to
point out, that SDL 1.2 in general is not being developed any more.
Also, make a correction:
"DOSBox does indicate support" -> "does not"
Information in comparison table is based on developer testing on Linux
and user reports on Windows.
Remove VS-related info from INSTALL file instead of duplicating it in
README.md.
