Typedefs starting with `v' in src

• vertex_t src/r_local.h:50
• visplane_t src/r_local.h:387
• vissprite_t src/r_local.h:366
• viswall_t src/r_local.h:345
• vldoor_e src/p_spec.h:241
• vldoor_t src/p_spec.h:254