blkin: drop boost dependency

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/blkin b/src/blkin
index 22016b31575015ef695f1cf6b9df918e831d0efb..9fe7c4cc0ff31297f9028761a4a12eae934ba362 160000 (submodule)
--- a/src/blkin
+++ b/src/blkin
@@ -1 +1 @@
-Subproject commit 22016b31575015ef695f1cf6b9df918e831d0efb
+Subproject commit 9fe7c4cc0ff31297f9028761a4a12eae934ba362