FIX: Account form stdbool.h being included in Python.h (#184)

As of CPython 3.11 (via python/cpython#29883) stdbool.h
is now included in Python.h so do attempt to redefine bool/true/false.

Author: tacaswell

ast27/Include/asdl.h

@@ -8,8 +8,10 @@ typedef PyObject * string;
 typedef PyObject * object;
 
 #ifndef __cplusplus
+#ifndef __bool_true_false_are_defined
 typedef enum {false, true} bool;
 #endif
+#endif
 
 /* It would be nice if the code generated by asdl_c.py was completely
    independent of Python, but it is a goal the requires too much work

ast3/Python/ast.c

@@ -13,9 +13,12 @@
 #include <assert.h>
 
 // VS 2010 doesn't have <stdbool.h>...
+#ifndef __bool_true_false_are_defined
 typedef int bool;
 #define false 0
 #define true 1
+#endif
+
 
 #if PY_MINOR_VERSION < 6
 static PyObject *