Ports: Patch Python to deal with Serenity's strftime

The xmlrpc.client module has some trial-and-error logic at module import
time to figure out how to properly format years using strftime. There
have already been problems in the past with this code in Python (see
https://bugs.python.org/issue13305, which is still open), and Serenity
only adds to that.

This problem has been reported at https://bugs.python.org/issue45386, so
hopefully in time we won't need this patch anymore.

Ports/python3/patches/xmlrcp_client.patch

@@ -0,0 +1,27 @@
+--- Python-3.10.0/Lib/xmlrpc/client.py	2021-10-06 14:28:27.231681509 +0800
++++ Python-3.10.0/Lib/xmlrpc/client.py	2021-10-06 14:31:01.712267885 +0800
+@@ -264,16 +264,22 @@
+ 
+ # Issue #13305: different format codes across platforms
+ _day0 = datetime(1, 1, 1)
+-if _day0.strftime('%Y') == '0001':      # Mac OS X
++def _try(fmt):
++    try:
++        return _day0.strftime(fmt) == '0001'
++    except ValueError:
++        return False
++if _try('%Y'):      # Mac OS X
+     def _iso8601_format(value):
+         return value.strftime("%Y%m%dT%H:%M:%S")
+-elif _day0.strftime('%4Y') == '0001':   # Linux
++elif _try('%4Y'):   # Linux
+     def _iso8601_format(value):
+         return value.strftime("%4Y%m%dT%H:%M:%S")
+ else:
+     def _iso8601_format(value):
+         return value.strftime("%Y%m%dT%H:%M:%S").zfill(17)
+ del _day0
++del _try
+ 
+ 
+ def _strftime(value):