Allow building with python 3.12.

diff -u -r ../jack2-1.9.22/waflib/Context.py ./waflib/Context.py
--- ../jack2-1.9.22/waflib/Context.py	2023-02-02 11:04:10.000000000 +0000
+++ ./waflib/Context.py	2025-01-04 14:41:17.461095402 +0000
@@ -6,7 +6,7 @@
 Classes and functions enabling the command system
 """
 
-import os, re, imp, sys
+import os, re, sys, types
 from waflib import Utils, Errors, Logs
 import waflib.Node
 
@@ -660,7 +660,7 @@
 	except KeyError:
 		pass
 
-	module = imp.new_module(WSCRIPT_FILE)
+	module = types.ModuleType(WSCRIPT_FILE)
 	try:
 		code = Utils.readf(path, m='r', encoding=encoding)
 	except EnvironmentError: