Issue #18135: ssl.SSLSocket.write() now raises an OverflowError if the input
string in longer than 2 gigabytes, and ssl.SSLContext.load_cert_chain() raises
a ValueError if the password is longer than 2 gigabytes. The ssl module does
not support partial write.
Fix time.strftime("%Y") on AIX: raise a ValueError for year > 9999

time.strtime("%Y") returned "2345" when formatting year 12345.