Fix include/makefile so that the file include/gambit.h is regenerated when include/gambit.h.in is changed
Fix include/makefile so that the file include/gambit.h is regenerated when include/gambit.h.in is changed

ivankelly/gambit,jasperla/gambit,jasperla/gambit,thewhimer/gambit,thewhimer/gambit,ivankelly/gambit,thewhimer/gambit,acenode/gambit,thewhimer/gambit,BeImprovised/gambit,thewhimer/gambit,BeImprovised/gambit,acenode/gambit,BeImprovised/gambit,acenode/gambit,jasperla/gambit,ivankelly/gambit,acenode/gambit,thewhimer/gambit,jasperla/gambit,BeImprovised/gambit