skeleton/pap2.cpp: Removed source file with no license information.

I don't like to do this, but we can't ship with sources that have no
license information - without explicit licensing, "all rights reserved"
is the default.  This would create a release with no clarity on whether
it can be redistributed at all.

Author: cuavas

src/mame/mame.lst

@@ -42379,9 +42379,6 @@ p8000_16                        //
 @source:skeleton/palestra.cpp
 palestra
 
-@source:skeleton/pap2.cpp
-pap2
-
 @source:skeleton/pcksurfer.cpp
 pcksurfer                       // (c) 2006 Datawind