Use fixed version of civetweb to avoid warning.

The warning about SSLv23_client_method is because when using dynamic
linking, this should always be non-zero.  That's inside of civetweb,
so this commit is to pull the submodule up to the fix.

Signed-off-by: Marcus Watts <mwatts@redhat.com>

diff --git a/src/civetweb b/src/civetweb
index 8d271315a541218caada366f84a2690fdbd474a2..554fa96229bcb2de08c9e9d976a3153d324126b3 160000 (submodule)
--- a/src/civetweb
+++ b/src/civetweb
@@ -1 +1 @@
-Subproject commit 8d271315a541218caada366f84a2690fdbd474a2
+Subproject commit 554fa96229bcb2de08c9e9d976a3153d324126b3