Export zlib version in a variable

[dveeden]

If innodb_log_compressed_pages is used one needs to be careful which zlib version in used when using InnoDB recovery. Among others this could impact backup/restore with a hot backup tool or a storage snapshot.

This patch exposes the zlib version.
Currently this is only exposed via:

storage/innobase/srv/srv0start.cc:      ib::info() << "Compressed tables use zlib " ZLIB_VERSION

Related: https://bugs.launchpad.net/percona-xtrabackup/+bug/1736139

[dveeden]

This is what it does:

mysql> show global variables like 'version_compile_zlib';
+----------------------+--------+
| Variable_name        | Value  |
+----------------------+--------+
| version_compile_zlib | 1.2.11 |
+----------------------+--------+
1 row in set (0.01 sec)

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[dveeden]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=88825 for updates.
Thanks