prefix internal sqlite symbols with _pysqlite_ (GH-8215)

diff --git a/Modules/_sqlite/module.h b/Modules/_sqlite/module.h
index d3df912..6f90934 100644
--- a/Modules/_sqlite/module.h
+++ b/Modules/_sqlite/module.h
@@ -42,9 +42,9 @@
  * functions, that convert the SQL value to the appropriate Python value.
  * The key is uppercase.
  */
-extern PyObject* converters;
+extern PyObject* _pysqlite_converters;
 
-extern int _enable_callback_tracebacks;
+extern int _pysqlite_enable_callback_tracebacks;
 extern int pysqlite_BaseTypeAdapted;
 
 #define PARSE_DECLTYPES 1