yafc: update to 1.3.2
SDL2: update to 2.0.3
qpid-cpp: update to 0.26

Also, remove a workaround that's no longer needed.
minecraft: update to latest launcher

I changed the versioning scheme to the latest launcher date, which is
independent of minecraft version and is actually what the expression gets.
Merge pull request #2082 from cpages/update

Updates for maintained packages