Update Cake version to latest.

lewissbaker · lewissbaker · commit 2d892317371a · 2018-08-08T07:57:06.000-07:00
This should fix lewissbaker#82 (vswhere output decoding issues)
diff --git a/tools/cake b/tools/cake
@@ -1 +1 @@
-Subproject commit db43f336b95d367163b967491f4e22d252ae59b4
+Subproject commit a8fafef002a431ef906303f3db0bb40c3e56fefb
