silence some clang warnings about dead code

Cython/Utility/Optimize.c

@@ -229,7 +229,7 @@ static CYTHON_INLINE PyObject *__Pyx_PyDict_SetDefault(PyObject *d, PyObject *ke
     PyObject* value;
 #if PY_VERSION_HEX >= 0x030400A0
     // we keep the method call at the end to avoid "unused" C compiler warnings
-    if (1) {
+    if ((1)) {
         value = PyDict_SetDefault(d, key, default_value);
         if (unlikely(!value)) return NULL;
         Py_INCREF(value);

Cython/Utility/Profile.c

@@ -161,7 +161,7 @@
   #define __Pyx_TraceDeclarations
   #define __Pyx_TraceFrameInit(codeobj)
   // mark error label as used to avoid compiler warnings
-  #define __Pyx_TraceCall(funcname, srcfile, firstlineno, nogil, goto_error)   if (1); else goto_error;
+  #define __Pyx_TraceCall(funcname, srcfile, firstlineno, nogil, goto_error)   if ((1)); else goto_error;
   #define __Pyx_TraceException()
   #define __Pyx_TraceReturn(result, nogil)
 
@@ -224,7 +224,7 @@
   #endif
 #else
   // mark error label as used to avoid compiler warnings
-  #define __Pyx_TraceLine(lineno, nogil, goto_error)   if (1); else goto_error;
+  #define __Pyx_TraceLine(lineno, nogil, goto_error)   if ((1)); else goto_error;
 #endif
 
 /////////////// Profile ///////////////