Don't add generated sources to source set

Change-Id: I22bed2260a7499205380798a8cf2496b0808ccb0
diff --git a/build.gradle b/build.gradle
index 92b72d0..59e6b9e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -128,7 +128,7 @@
     }
     examples {
         java {
-            srcDirs = ['src/test/examples', 'build/generated/source/apt/examples']
+            srcDirs = ['src/test/examples']
         }
         output.resourcesDir = 'build/classes/examples'
     }