Use the right version of build tools.

Change-Id: I80ebd53f2f46213001633c135c7fd9a5f8502658
diff --git a/tests/repo/library/build.gradle b/tests/repo/library/build.gradle
index a545df9..3ec3583 100644
--- a/tests/repo/library/build.gradle
+++ b/tests/repo/library/build.gradle
@@ -22,7 +22,7 @@
 
 android {
     compileSdkVersion 15
-    buildToolsVersion "1.0"
+    buildToolsVersion "17.0"
 }
 
 group = 'com.example.android.multiproject'