Defines starting with `s' in src/od-win32

• secs_per_day src/od-win32/posixemu.c:40
• SETERRNO src/od-win32/bsdsock.c:44
• SETHERRNO src/od-win32/bsdsock.c:45
• SETSIGNAL src/od-win32/bsdsock.c:48
• SOCKVER_MAJOR src/od-win32/bsdsock.c:71
• SOCKVER_MINOR src/od-win32/bsdsock.c:72