civetweb: update submodule to support setting of http status

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>

diff --git a/src/civetweb b/src/civetweb
index af76623303242ba3157fef19134f27efd38977e0..8d271315a541218caada366f84a2690fdbd474a2 160000 (submodule)
--- a/src/civetweb
+++ b/src/civetweb
@@ -1 +1 @@
-Subproject commit af76623303242ba3157fef19134f27efd38977e0
+Subproject commit 8d271315a541218caada366f84a2690fdbd474a2