fix(system_python): Remove printing of not always present attribute

This attribute is not part of the Python public API and in  Debian 10
Buster (OpenJDK 11, gcc 8.3.0) it seems to not be defined.

This reverts one of the debug logging statements added in
bazel-contrib#3667

Fixes bazel-contrib#3774

Author: limdor

CHANGELOG.md

@@ -80,6 +80,8 @@ END_UNRELEASED_TEMPLATE
 * (pypi) Fix `importlib.metadata.files` by ensuring `RECORD` is included in
   installed wheel targets, except when built from sdist
   ([#3024](https://github.com/bazel-contrib/rules_python/issues/3024)).
+* (bootstrap) Fix AttributeError exception on Debian 10 Booster
+  ([#3774](https://github.com/bazel-contrib/rules_python/issues/3774)).
 
 
 {#v0-0-0-added}

python/private/python_bootstrap_template.txt

@@ -568,7 +568,6 @@ def main():
   print_verbose("VENV_REL_SITE_PACKAGES:", VENV_REL_SITE_PACKAGES)
   print_verbose("WORKSPACE_NAME:", WORKSPACE_NAME )
   print_verbose("bootstrap sys.executable:", sys.executable)
-  print_verbose("bootstrap sys._base_executable:", sys._base_executable)
   print_verbose("bootstrap sys.version:", sys.version)
 
   args = sys.argv[1:]