This patch removed some previously unsupported scanf format specifiers.
We still don't support these properly, but we can parse and ignore
them, which is equivalent to what this patch was doing.
This port was still using the upstream's master branch as opposed to
a fixed git commit.
Also, now that SDL2 is installed into /usr/local the build failed.
I have also removed an obsolete patch because we're now linking
against shared libraries for SDL2 and those already have appropriate
library dependencies.
