Issue #27961: Define HAVE_LONG_LONG as 1.
Fix backward compatibility issue, HAVE_LONG_LONG was defined but empty, whereas
it is defined as 1 in Python 3.5.
diff --git a/Include/pyport.h b/Include/pyport.h
index 28bf4b2..52a91a0 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -39,7 +39,7 @@
// long long is required. Ensure HAVE_LONG_LONG is defined for compatibility.
#ifndef HAVE_LONG_LONG
-#define HAVE_LONG_LONG
+#define HAVE_LONG_LONG 1
#endif
#ifndef PY_LONG_LONG
#define PY_LONG_LONG long long