Typedefs starting with `i' in quake2

• identitypalette_t 321/win32/rw_dib.c:76
• image_t 321/ref_soft/r_local.h:71
• imagetype_t 321/ref_soft/r_local.h:61
• in_state_t 321/linux/rw_linux.h:34
• ipfilter_t 321/ctf/g_svcmds.c:64