Remove old env hack to allow screen saver.

src/conio/sdlfuncs.c

@@ -27,7 +27,6 @@ int load_sdl_funcs(struct sdlfuncs *sdlf)
 	dll_handle	sdl_dll;
 	const char *libnames[]={"SDL2", "SDL", NULL};
 
-	putenv("SDL_VIDEO_ALLOW_SCREENSAVER=1");
 	sdlf->gotfuncs=0;
 	if((sdl_dll=xp_dlopen(libnames,RTLD_LAZY|RTLD_GLOBAL,SDL_PATCHLEVEL))==NULL)
 		return(-1);