hog.pencil.c, remove const type qualifiers from some declarations to avoid a problem in PPCG
hog.pencil.c, remove const type qualifiers from some declarations to avoid a problem in PPCG


Former-commit-id: 7ac8a69c568dc77b1599b1690d6cd7ffe7ec5bb8
pencil-language/pencil-benchmark,rbaghdadi/pencil-benchmark,rbaghdadi/pencil-benchmark,dividiti/pencil-benchmark,dividiti/pencil-benchmark,rbaghdadi/pencil-benchmark,pencil-language/pencil-benchmark,pencil-language/pencil-benchmark,dividiti/pencil-benchmark