Adding fuzz directory and modifications to support it.

[catenacyber]

Adds a new target to fuzz the mysql client

Quickly finds 2 NULL derefs, but looks ok after adding checks for these

[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

[catenacyber]

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

[mysql-admin]

Hi @catenacyber @ChAlv ,
Thanks for contributing to MySQL
As this contribution was authored by @ChAlv , @ChAlv is the one that is authorized to contribute it and the person that needs to confirm it is submitted under the terms of the (his) OCA.

@ChAlv 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
==Omer

[catenacyber]

Sorry if I messed up my git work.

This was a work started by Christophe Alves, me and 2 other (in google/oss-fuzz#2593 ), but I changed almost all of it, re-squashing everything into the first commit.

Should I open a new PR with the commit as my own ?

[mysql-admin]

Hi @catenacyber ,
I different PR is probably the simplest way to address this as we need to have a match between the author and the OCA submitter

Thanks and apologies for the 'detour'
==Omer

[catenacyber]

@mysql-admin is it better this way ?

[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=118350 for updates.
Thanks