Ignore warning in icon.c

Compare 256 with unsigned char doesn't make sense. But let's fix in
upstream.

Test: None
Change-Id: Ib3607acc1dd6088664b86f4554f29d410f92d717
diff --git a/coders/Android.bp b/coders/Android.bp
index 09e20e5..415d1c6 100644
--- a/coders/Android.bp
+++ b/coders/Android.bp
@@ -30,6 +30,7 @@
         "-Werror",
         "-Wno-for-loop-analysis",
         "-Wno-sign-compare",
+        "-Wno-tautological-constant-out-of-range-compare",
         "-Wno-unused-function",
         "-Wno-unused-parameter",
     ],