rgw: update civetweb submodule

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

diff --git a/src/civetweb b/src/civetweb
index ed8e8d19576c4baac3aff643c0fd9b0c1218bb33..79d0efdabb6a707c2f7c0e65525f39c7736341ec 160000 (submodule)
--- a/src/civetweb
+++ b/src/civetweb
@@ -1 +1 @@
-Subproject commit ed8e8d19576c4baac3aff643c0fd9b0c1218bb33
+Subproject commit 79d0efdabb6a707c2f7c0e65525f39c7736341ec