Bump buildToolsVersions

The new CI image has 24, not 23.0.3.

Privileged-Extension/build.gradle

@@ -11,7 +11,7 @@ dependencies {
 
 android {
     compileSdkVersion 23
-    buildToolsVersion '23.0.3'
+    buildToolsVersion '24'
 
     defaultConfig {
         minSdkVersion 8

app/build.gradle

@@ -140,7 +140,7 @@ if (!hasProperty('sourceDeps')) {
 
 android {
     compileSdkVersion 23
-    buildToolsVersion '23.0.3'
+    buildToolsVersion '24'
     useLibrary 'org.apache.http.legacy'
 
     buildTypes {

privileged-api-lib/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion '23.0.3'
+    buildToolsVersion '24'
 
     defaultConfig {
         minSdkVersion 8