PrBoom 2.2.1 released

Changes from v2.2.0 to v2.2.1
- improved fix for demo sync problems with lost souls bouncing off floors
- fixed bug where loading a -fast or -respawn savegame failed to restore those options properly
- fixed demo sync bug with doors also tagged to lift triggers
- fix some endianness problems in the OpenGL renderer
- hopefully fixed some problems compiling for Linux/ARM
- fix multi-level demo time totals to agree with compet-n
- linux rpm is now a bit more standardised