Disable javac warnings for examples.

Bug:
Change-Id: I414166af0198aabe320e51dbe57c29a334539022
diff --git a/build.gradle b/build.gradle
index 67d455a..60357de 100644
--- a/build.gradle
+++ b/build.gradle
@@ -534,7 +534,7 @@
         classpath = sourceSets.examples.compileClasspath
         sourceCompatibility = JavaVersion.VERSION_1_7
         targetCompatibility = JavaVersion.VERSION_1_7
-        options.compilerArgs += ["-Xlint:-options"]
+        options.compilerArgs = ["-Xlint:none"]
     }
     examplesDir.eachDir { dir ->
         def name = dir.getName();