Dosbox: fix build and move to $binDir
Dosbox: fix build and move to $binDir

* Dosbox is not only a standalone application, it is also used to run
DOS executables non-interactively
* There are several front-ends for it which could be put in $appsDir
* In either case, things are simpler if Dosbox is in the path, it would
not be if installed in home/config/apps.

Begasus/haikuports,Begasus/haikuports,moochris/haikuports,haikuports/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,miqlas/haikuports,moochris/haikuports,koletzky/haikuports,haikuports/haikuports,Begasus/haikuports,miqlas/haikuports,moochris/haikuports,nielx/haikuports,nielx/haikuports,koletzky/haikuports,koletzky/haikuports,miqlas/haikuports,haikuports/haikuports,Begasus/haikuports,nielx/haikuports