MDEV-35905: Revert CONC-710 induced mysqlbinlog FIXME

[bnestere]

mariadb-corporation/mariadb-connector-c@1a2ed3f
and
mariadb-corporation/mariadb-connector-c@78e56a7
of CONC-710 mistakenly moved Item_result from mariadb_com.h to
mariadb_rpl.h thinking it was only used by Connector/C's binlog API;
however it is also used by mysqlbinlog in the server. This broke
server compilation.

e41145f
provided a temporary fix to re-define Item_result in mysqlbinlog.cc
to get the build working

mariadb-corporation/mariadb-connector-c@75d381f
reverted the change from CONC-710 in libmariadb to move Item_result
back to mariadb_com.h

This patch updates the server libmariadb version to include the
latest connector-c fix, and reverts the old temporary fix, so
mysqlbinlog uses Item_result from mariadb_com.h again.

It was initially tested locally by compiling and running MTR with an
updated libmariadb submodule, and then verified via CI runs,
e.g. this build

[dr-m]

@vaintroub raised some concerns in MDEV-35905, which may need to be addressed first.

You’re not using the pull request template. In this case, it would have been interesting to read how this was tested, such as, pointing to a CI run that includes an up-to-date libmariadb submodule.

The commit message as well as the pull request description should refer to the changes in other GitHub repositories in the usual GitHub notation, for example, mariadb-corporation/mariadb-connector-c@75d381f (mariadb-corporation/mariadb-connector-c@75d381ffb2bd183912759819bd60d685c015eeb9).

[bnestere]

The commit message as well as the pull request description should refer to the changes in other GitHub repositories in the usual GitHub notation,

Ah, I didn't know about that, thanks for the pointer! I've re-written the commit message (and will edit the PR description accordingly, along with test info)

[vuvova]

it's already fixed in bb-11.4-branch