'git submodules' is complaining about 16/doslib, shut it up by removing

the module point, it's src/lib/doslib. Now I can git submodule update.

diff --git a/16/doslib b/16/doslib
deleted file mode 160000 (submodule)
index 9756904..0000000
--- a/16/doslib
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 975690444b74e8f28ad288412c0b0c754fab2342