Partially revert "assign true and false structs"

This reverts commit 117a8fc.

Author: timfel

graalpython/com.oracle.graal.python.cext/include/Python.h

@@ -100,6 +100,16 @@
 #include "import.h"
 #include "pycapsule.h"
 
+// our impls
+#ifdef Py_True
+#undef Py_True
+#define Py_True truffle_invoke(PY_TRUFFLE_CEXT, "Py_True")
+#endif
+
+#ifdef Py_False
+#undef Py_False
+#define Py_False truffle_invoke(PY_TRUFFLE_CEXT, "Py_False")
+#endif
 
 #undef Py_NoValue
 #define Py_NoValue truffle_invoke(PY_TRUFFLE_CEXT, "Py_NoValue")