Fix incremental android extensions test

Weirdly merge resource task was failing when run incrementally
if support library is present

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/AndroidExtensionsProject/app/build.gradle

@@ -20,6 +20,5 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:23.1.1'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }