title: Androidx modules, android:attr/ttcIndex & android:attr/fontVariationSettings not found
body: <p>I'm migrating all my support/appcompat libraries to androidx.
  After all updates I can't build my project because of this error</p>
  
  <pre><code>:app:processDebugManifest UP-TO-DATE
  AGPBI: {"kind":"error","text":"error: resource android:attr/fontVariationSettings not found.","sources":[{"file":"/Users/xxx/.gradle/caches/transforms-1/files-1.1/appcompat-v7-27.1.1.aar/7cae290a69b05f5ffc25283e26a7eb4a/res/values/values.xml","position":{"startLine":250,"startColumn":4,"startOffset":27058,"endColumn":68,"endOffset":27122}}],"original":"","tool":"AAPT"}
  AGPBI: {"kind":"error","text":"error: resource android:attr/ttcIndex not found.","sources":[{"file":"/Users/xxx/.gradle/caches/transforms-1/files-1.1/appcompat-v7-27.1.1.aar/7cae290a69b05f5ffc25283e26a7eb4a/res/values/values.xml","position":{"startLine":250,"startColumn":4,"startOffset":27058,"endColumn":68,"endOffset":27122}}],"original":"","tool":"AAPT"}
  :app:processDebugResources
  </code></pre>
  
  <p>I tried to include one by one all my dependencies to identify which one is causing the issue. I was able to build only if I remove the Room library ¯\_(ツ)_/¯</p>
  
  <p><a href="https://developer.android.com/topic/libraries/architecture/adding-components#room" rel="noreferrer">https://developer.android.com/topic/libraries/architecture/adding-components#room</a></p>
  
  <p>It's weird because issue seems to come from styling-ish resources, but room is just a database library.</p>
  
  <p><strong>Is anyone have any ideas or solution to include room without breaking everything ?</strong></p>
  
  <p>===============================</p>
  
  <p>my conf:</p>
  
  <pre><code>compileSdkVersion 27
  buildToolsVersion 27.0.3
  
  defaultConfig {
      minSdkVersion 16
      targetSdkVersion 27
  }
  
  dependencies {
      // ROOM
      implementation ('androidx.room:room-runtime:' + androidxRoomVersion)
      implementation ('androidx.room:room-rxjava2:' + androidxRoomVersion)
      implementation ('androidx.room:room-guava:' + androidxRoomVersion)
      kapt ('androidx.room:room-compiler:' + androidxRoomVersion)
  }
  </code></pre>
  
  <p>with: androidxRoomVersion = 2.0.0-alpha1</p>