[xbuild] Bump buildtools to get support for netstandard 1.6
authorAnkit Jain <ankit.jain@xamarin.com>
Wed, 14 Dec 2016 19:54:35 +0000 (14:54 -0500)
committerAnkit Jain <ankit.jain@xamarin.com>
Wed, 14 Dec 2016 19:57:33 +0000 (14:57 -0500)
https://github.com/mono/buildtools/commit/9b6ee8686be55a983d886938165b6206cda50772

external/buildtools

index a7dbffc17d029f2d66f56ddc9f50349a1bc0dcfe..9b6ee8686be55a983d886938165b6206cda50772 160000 (submodule)
@@ -1 +1 @@
-Subproject commit a7dbffc17d029f2d66f56ddc9f50349a1bc0dcfe
+Subproject commit 9b6ee8686be55a983d886938165b6206cda50772