Add -E command line switch (ignore environment variables like PYTHONHOME
and PYTHONPATH).
diff --git a/Modules/getpath.c b/Modules/getpath.c
index c7567f7..2fd8f75 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -365,7 +365,7 @@
     static char delimiter[2] = {DELIM, '\0'};
     static char separator[2] = {SEP, '\0'};
     char *pythonpath = PYTHONPATH;
-    char *rtpypath = getenv("PYTHONPATH");
+    char *rtpypath = Py_GETENV("PYTHONPATH");
     char *home = Py_GetPythonHome();
     char *path = getenv("PATH");
     char *prog = Py_GetProgramName();