Issue #26476: Fixed compilation error when use PyErr_BadInternalCall() in C++.
Patch by Jeroen Demeyer.
diff --git a/Python/errors.c b/Python/errors.c
index e7c221c..d823e13 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -532,7 +532,7 @@
 #endif /* MS_WINDOWS */
 
 void
-_PyErr_BadInternalCall(char *filename, int lineno)
+_PyErr_BadInternalCall(const char *filename, int lineno)
 {
     PyErr_Format(PyExc_SystemError,
                  "%s:%d: bad argument to internal function",