Merge pull request #67081 from adamemerson/wip-gcc16-clang21

Fixes for GCC 16 and Clang 21

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Casey Bodley <cbodley@redhat.com>
Reviewed-by: Kefu Chai <k.chai@proxmox.com>

diff --cc src/mds/MDCache.cc
Simple merge

diff --cc src/rgw/driver/rados/rgw_datalog.cc
Simple merge