gh-187: Support environment variables PYTHON_GIL / PYTHON_CPU_COUNT (#188)

* gh-187: Support environment variables PYTHON_GIL / PYTHON_CPU_COUNT

* Update

* Update CI

* update

* Update

* Address code review

* Address code review

* Revert CI file

Author: corona10

pyperf/_utils.py

@@ -266,8 +266,9 @@ def create_environ(inherit_environ, locale, copy_all):
     if copy_all:
         return os.environ
     env = {}
-
-    copy_env = ["PATH", "PYTHONPATH", "HOME", "TEMP", "COMSPEC", "SystemRoot", "SystemDrive"]
+    copy_env = ["PATH", "HOME", "TEMP", "COMSPEC", "SystemRoot", "SystemDrive",
+                # Python specific variables
+                "PYTHONPATH", "PYTHON_CPU_COUNT", "PYTHON_GIL"]
     if locale:
         copy_env.extend(('LANG', 'LC_ADDRESS', 'LC_ALL', 'LC_COLLATE',
                          'LC_CTYPE', 'LC_IDENTIFICATION', 'LC_MEASUREMENT',