[Android] Fix bugzilla58868 (#1106)

* [Android] Only set elevation in Lolipop or newer

* Update submodule

2 files changed, 14 insertions, 8 deletions

diff --git a/Xamarin.Forms.Build b/Xamarin.Forms.Build
-Subproject 321833ab005b47c6df958a84815b5a8d351f596
+Subproject 56f7f727597b1fea74a6fe1598cef529d02defb
diff --git a/Xamarin.Forms.Platform.Android/Platform.cs b/Xamarin.Forms.Platform.Android/Platform.cs
index 322de265..c0fc2099 100644
--- a/Xamarin.Forms.Platform.Android/Platform.cs
+++ b/Xamarin.Forms.Platform.Android/Platform.cs
@@ -1134,17 +1134,23 @@ namespace Xamarin.Forms.Platform.Android
 			{
 				//On Material design the button states use Elevation property, we need to make sure
 				//we update the elevation of other controls to be over the previous one
-				if (!_minimumElevation.ContainsKey(i))
-					_minimumElevation[i] = GetChildAt(i).Elevation;
-				for (int j = 0; j < _minimumElevation.Count() - 1; j++)
+				if (Forms.IsLollipopOrNewer)
 				{
-					while (_minimumElevation[j] > _minimumElevation[j + 1])
+					if (!_minimumElevation.ContainsKey(i))
 					{
-						_minimumElevation[j + 1] = _minimumElevation[j] + 1;
-						GetChildAt(j + 1).Elevation = _minimumElevation[j + 1];
+						_minimumElevation[i] = GetChildAt(i).Elevation;
+					}
+						
+					for (int j = 0; j < _minimumElevation.Count() - 1; j++)
+					{
+						while (_minimumElevation[j] > _minimumElevation[j + 1])
+						{
+							_minimumElevation[j + 1] = _minimumElevation[j] + 1;
+							GetChildAt(j + 1).Elevation = _minimumElevation[j + 1];
+						}
+						if (j == i)
+							break;
 					}
-					if (j == i)
-						break;
 				}
 				return base.GetChildDrawingOrder(childCount, i);
 			}