Started working on a tiny input/ActionMapper refactor,
then everything fell apart and i ended up doing this.
I'm sorry.
Pretty much untested because input mapping is broken right now,
will fix that next.
The game cannot work with those anyhow...
```c
#undef BBGE_BUILD_IRRKLANG
#undef BBGE_BUILD_OPENALOGG
#undef BBGE_BUILD_XINPUT
#undef BBGE_BUILD_DELAYXINPUT
```
The fix as suggested by Jonas Kulla on the mailing list is also in.
There hasn't been any extensive testing, and it may not yet compile
on platforms other than win32.