Bump to linker/d15-2-xamarin-android/81007dfb (#563)

radekdoulik · radekdoulik · commit be378fd0225d · 2017-04-26T09:09:41.000+02:00
Fixes: https://bugzilla.xamarin.com/show_bug.cgi?id=55053
diff --git a/external/linker b/external/linker
@@ -1 +1 @@
-Subproject commit dfea33750a23387a3deb909954b8e25b0b4e20a3
+Subproject commit 81007dfb0c48c1908d7540571d76fc7107128714
