Fix the python interface (bz 1910923).

z3-python.patch

@@ -0,0 +1,21 @@
+--- a/scripts/update_api.py	2020-09-10 12:51:28.000000000 -0600
++++ b/scripts/update_api.py	2020-12-25 17:03:00.196777823 -0700
+@@ -1755,15 +1755,15 @@ def write_core_py_preamble(core_py):
+ # Automatically generated file
+ import sys, os
+ import ctypes
+-import pkg_resources
++import sysconfig
+ from .z3types import *
+ from .z3consts import *
+ 
+-_ext = 'dll' if sys.platform in ('win32', 'cygwin') else 'dylib' if sys.platform == 'darwin' else 'so'
++_ext = 'dll' if sys.platform in ('win32', 'cygwin') else 'dylib' if sys.platform == 'darwin' else 'so.@MAJVER@'
+ _lib = None
+ _default_dirs = ['.',
+                  os.path.dirname(os.path.abspath(__file__)),
+-                 pkg_resources.resource_filename('z3', 'lib'),
++                 sysconfig.get_config_var('LIBDIR'),
+                  os.path.join(sys.prefix, 'lib'),
+                  None]
+ _all_dirs = []