bug 84299: Symlinks for mtr mem directory not supported

[grooverdan]

Thanks @bjornmu for feedback (#116 (comment)). Here is the check requested.

As per http://perldoc.perl.org/functions/-X.html -l will return false where not supported by OS so this should still work on Windows.

I note also on my Fedora based distro that /run/user/1000 is a shm too. The following may be added as well.

edit: /run/user/1000 isn't that good of a choice. Other locations are bigger.

$ df -h /dev/shm
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           3.8G  154M  3.6G   5% /dev/shm
$ df -h /run/user/1000/
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           766M   28K  766M   1% /run/user/1000
$ df -h /tmp
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           3.8G  3.0G  850M  78% /tmp

[grooverdan]

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. 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

[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=84299 for updates.
Thanks

[bjornmu]

Whether -l "works" on Windows is actually irrelevant since --mem is not supported on Windows in the first place, it's ignored. But it doesn't hurt to double check anyway. :-)