- fixed dependence: recompile sdl.o if sdl.h is modified
- fixed dependence: recompile sdl.o if sdl.h is modified

dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dbrashear/bochs,dariaphoebe/bochs