Update oval_collection.c
Update oval_collection.c

Removed obsolote/weird _debugStack stuff (see #818).
OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,jan-cerny/openscap,OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap,jan-cerny/openscap,redhatrises/openscap,jan-cerny/openscap,mpreisler/openscap,OpenSCAP/openscap,OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,mpreisler/openscap,mpreisler/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,jan-cerny/openscap