Fix compiler warnings on "make android_arm"

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 7da95bc1542885717669d684e0deab531b080978..ea0aac998f89aa304b13990ca22a05f5e36d8a5f 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -912,7 +912,8 @@ inline bool IsDynamicVariableMode(VariableMode mode) {
 
 
 inline bool IsDeclaredVariableMode(VariableMode mode) {
-  return mode >= VAR && mode <= CONST;
+  STATIC_ASSERT(VAR == 0);  // Implies that mode >= VAR.

[Jakob Kummerow, 2016/08/25 11:35:11]

../../src/globals.h:915:15: warning: comparison is always true due to limited
range of data type [-Wtype-limits]
   return mode >= VAR && mode <= CONST;
               ^

+  return mode <= CONST;
 }