MDEV-19237 Skip sending metadata when possible for binary protocol.

Do not resend metadata, if metadata does not change between prepare and
execute of prepared statement, or between executes.

Currently, metadata of *every* prepared statement will be checksummed,
and change is detected once checksum changes.

This is not from ideal, performance-wise. The code for
better/faster detection of unchanged metadata, is already in place, but
currently disabled due to PS bugs, such as MDEV-23913.

1 files changed, 0 insertions, 0 deletions

diff --git a/libmariadb b/libmariadb
-Subproject e38244220646a7e95c9be22576460aa7a4eb715
+Subproject 3cf45a2c5711936840bdbdb3a0d74869d12e69a