Fix the only non-C90 comment to be C90 compatible. (#566)

ndparker · serhiy-storchaka · commit f7eda3882e2f · 2017-03-08T20:24:22.000+02:00
diff --git a/Include/pyport.h b/Include/pyport.h
@@ -37,7 +37,7 @@ Used in:  Py_SAFE_DOWNCAST
  * integral synonyms.  Only define the ones we actually need.
  */
 
-// long long is required. Ensure HAVE_LONG_LONG is defined for compatibility.
+/* long long is required. Ensure HAVE_LONG_LONG is defined for compatibility. */
 #ifndef HAVE_LONG_LONG
 #define HAVE_LONG_LONG 1
 #endif
