seastar: pickup change to pin socket to fixed core

and clang / GCC-10 related fixes

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/seastar b/src/seastar
index fb4d559f1417edd44580a44ee90c25c3cb76ea6e..77b23a18613d2e7f09f749aa10061dd3ee3e6032 160000 (submodule)
--- a/src/seastar
+++ b/src/seastar
@@ -1 +1 @@
-Subproject commit fb4d559f1417edd44580a44ee90c25c3cb76ea6e
+Subproject commit 77b23a18613d2e7f09f749aa10061dd3ee3e6032