Lazy fix for server build

Added tag 0.9.21-release, fab746a3597e for changeset 7e55468ffe38

Update .hgignore file

merge, mah friend, long time no see

- some new mission icons - add variable portal limiter (and effects) to TechRacer - allow variable (not just infinite) ufo fuel - possibly break stuff some - more whitespace?

cursor x/y when targeting for mikade's visual effects. this is not synced

Fix building hedgewars-server

Allow skipping the bundle step after install on OSX

Make sure that the png library name is always defined

Fix libsdl bundling on OSX when library rather than framework is used