[PR PATCH] Update nfs-ganesha-callout

[github at samba.org]

There is a new pull request by ryno83 against master on the Samba Samba Github repository

https://github.com/ryno83/samba patch-1
https://github.com/samba-team/samba/pull/218

Update nfs-ganesha-callout
On debian buster, this variable doesn't exist anymore. Look at this PR as a reference:
https://github.com/gluster/storhaug/pull/30

## Samba is moving to GitLab
The samba project is moving to GitLab, please consider opening a merge request there instead.
Instructions for setting up can be found at: https://wiki.samba.org/index.php/Samba_CI_on_gitlab
The GitLab repository can be found here: https://gitlab.com/samba-team/samba


A patch file from https://github.com/samba-team/samba/pull/218.patch is attached
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