rgw: bump mimic civetweb with ssl & abs url fixes

Signed-off-by: Abhishek Lekshmanan <abhishek@suse.com>

diff --git a/src/civetweb b/src/civetweb
index ff2881e2cd5869a71ca91083bad5d12cccd22136..088b813968c7e04ca9b84ec4cbdf19bb06038183 160000 (submodule)
--- a/src/civetweb
+++ b/src/civetweb
@@ -1 +1 @@
-Subproject commit ff2881e2cd5869a71ca91083bad5d12cccd22136
+Subproject commit 088b813968c7e04ca9b84ec4cbdf19bb06038183