Fix build

Xamarin.Forms.Platform.Android/Cells/TextViewExtensions.cs

@@ -0,0 +1,21 @@
+using Android.Content;
+using Android.OS;
+using Android.Widget;
+
+namespace Xamarin.Forms.Platform.Android
+{
+	internal static class TextViewExtensions
+	{
+		public static void SetTextAppearanceCompat(this TextView textView, Context context, int resId)
+		{
+			if ((int)Build.VERSION.SdkInt < 23)
+			{
+#pragma warning disable 618 // Using older version of SetTextAppearance for compatibility with API 15-22
+				textView.SetTextAppearance(context, resId);
+#pragma warning restore 618
+			}
+			else
+				textView.SetTextAppearance(resId);
+		}
+	}
+}