Bug 1747332 - Avoid creating a virtualenv when running configure.py --help....

Bug 1747332 - Avoid creating a virtualenv when running configure.py --help. r=firefox-build-system-reviewers,andi

Differential Revision: https://phabricator.services.mozilla.com/D134583

configure.py

@@ -42,7 +42,6 @@ import six
 
 
 def main(argv):
-    _activate_build_virtualenv()
     config = {}
 
     if "OLD_CONFIGURE" not in os.environ:
@@ -50,6 +49,9 @@ def main(argv):
 
     sandbox = ConfigureSandbox(config, os.environ, argv)
 
+    if not sandbox._help:
+        _activate_build_virtualenv()
+
     clobber_file = "CLOBBER"
     if not os.path.exists(clobber_file):
         # Simply touch the file.