Defines starting with `b' in quakeworld

• BACKFACE_EPSILON quakeworld/client/glquake.h:94
• BASEHEIGHT quakeworld/client/gl_vidnt.c:34
• BASEWIDTH quakeworld/client/gl_vidnt.c:33
• BLOCK_HEIGHT quakeworld/client/gl_draw.c:112
• BLOCK_WIDTH quakeworld/client/gl_draw.c:111
• BMODEL_FULLY_CLIPPED quakeworld/client/r_local.h:30
• BOTTOM_RANGE quakeworld/client/render.h:24
• _BSD quakeworld/client/vid_x.c:22
• BSPVERSION quakeworld/client/bspfile.h:54
• bufptr quakeworld/client/d_copy.s:18
• BUTTON_ATTACK quakeworld/client/cl_cam.c:35
• BUTTON_JUMP quakeworld/client/cl_cam.c:34