DmtxTime bug

[shuaifeifan]

the size of 'sec' in DmtxTime(wrapper.py) is fixed to c_ulonglong which is not always true, it should keep the same size with time_t in C library. since time_t can be 32bits or 64bits according the exactly system, the defination of sec should also be changed by system. next patch can fix this problem(refer from: python/cpython#92869)

import platform
import ctypes
......
time_t=ctypes.c_int64
if platform.system() == 'Windows':
# Assume MSVC(?) - what about mingw/clang?
time_t = ctypes.c_int64
elif ctypes.sizeof(ctypes.c_void_p) == ctypes.sizeof(ctypes.c_int64):
# 64-bit platform of any kind - assume 64-bit time_t(?)
time_t = ctypes.c_int64
else:
# assume some kind of 32-bit platform(?)
time_t = ctypes.c_int32

class DmtxTime(Structure):
fields = [
#('sec', c_ulong), # Actually a time_t
('sec',time_t),
('usec', c_ulong),
]