Issue #21323: Fix http.server to again handle scripts in CGI subdirectories,

broken by the fix for security issue #19435.  Patch by Zach Byrne.

diff --cc Misc/ACKS
Simple merge

diff --cc Misc/NEWS
index f8c6abc120913d47b5c65bb5e1d40c8944fa5ffe,9425dc93c217bf388a58fa195e11de75b77a18c7..9fc2ca99b61a774756f289663ac343cba286784a
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -568,11 -499,6 +568,14 @@@ Librar
  - Issue #11571: Ensure that the turtle window becomes the topmost window
    when launched on OS X.
  
 +- Issue #21801: Validate that __signature__ is None or an instance of Signature.
 +
 +- Issue #21923: Prevent AttributeError in distutils.sysconfig.customize_compiler
 +  due to possible uninitialized _config_vars.
 +
++- Issue #21323: Fix http.server to again handle scripts in CGI subdirectories,
++  broken by the fix for security issue #19435.  Patch by Zach Byrne.
++
  Extension Modules
  -----------------