Correct testbed and cross-env arguments.

Author: freakboy3742

patch/Python/Python.patch

@@ -953,7 +953,7 @@ index 04a0d1fe65e..58695d56657 100644
 +                # f"--{context.ci_mode}-ci",
 +                "-uall",
 +                "--rerun",
-+                "--single-process",
++                # "--single-process",
 +                "-W",
 +                # Timeout handling requires subprocesses; explicitly setting
 +                # the timeout to -1 disables the faulthandler.

patch/Python/_cross_target.py.tmpl

@@ -81,4 +81,5 @@ sysconfig._BASE_PREFIX = sys.base_prefix
 sysconfig._BASE_EXEC_PREFIX = sys.base_exec_prefix
 
 # Force sysconfig data to be loaded (and cached).
-sysconfig._init_config_vars()
+sysconfig._CONFIG_VARS = None
+sysconfig.get_config_vars()