Wesley Chun's SF patch 511380: add CGIHTTPServer error supt for Win32
Wesley Chun's SF patch 511380: add CGIHTTPServer error supt for Win32

This uses os.popen3 (if it exists) to ensure that errors from a
non-Python CGI script are logged.

Bugfix candidate.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator