Automatic update of common submodule

From ef1ffdc to f2c6b95

diff --git a/common b/common
index ef1ffdcc6e6fca1f512f923a94c990e3534ba9a5..f2c6b95d0d98e97c37ffe27509709fdd41cd503c 160000 (submodule)
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit ef1ffdcc6e6fca1f512f923a94c990e3534ba9a5
+Subproject commit f2c6b95d0d98e97c37ffe27509709fdd41cd503c