rgw: add missing mutex header for std::once_flag

this fix was added directly to the jewel branch rather than backporting
from master, because the code on master compiles without this specific
include - it's likely included by another header, but backporting would
involve pulling in unrelated changes

Signed-off-by: Casey Bodley <cbodley@redhat.com>

diff --git a/src/rgw/rgw_http_client.cc b/src/rgw/rgw_http_client.cc
index 2a9817a23aee6c31fb048939c90d2068f4e83e1c..d8b4ca94167a5f978ef57f9cb7b805c09c2bfcee 100644 (file)
--- a/src/rgw/rgw_http_client.cc
+++ b/src/rgw/rgw_http_client.cc
@@ -2,6 +2,7 @@
 // vim: ts=8 sw=2 smarttab
 
 #include "include/compat.h"
+#include <mutex>
 
 #include <curl/curl.h>
 #include <curl/easy.h>