[wip] Fix install for buster

[alexAubin]

Problem

Install fails on Buster for various reasons

Solution

• Two dependencies changed name, so using e.g. libvpx4|libvpx5 to require either of these to be installed, to keep backward compatibility with stretch
• We don't need to call ynh_install_php since php7.3 is installed on Buster, so I'm using an if distrib == stretch to handle this.

N.B. : I only tested that the install works on Buster, didn't check that it doesn't break Strtech ... N.B. 2 : The 'restore' script should also be adjusted. Annnd maybe the upgrade script ? Idk.

PR Status

• [ ] Code finished.
• [ ] Tested with Package_check.
• [ ] Fix or enhancement tested.
• [ ] Upgrade from last version tested.
• [ ] Can be reviewed and tested.

Package_check results

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[kay0u]

We should check if we are on stretch before removing php :-) https://github.com/YunoHost-Apps/pixelfed_ynh/blob/931cb347dd88e26e1f35a74e2586447d8a22dddb/scripts/remove#L61

[yalh76]

We should check if we are on stretch before removing php :-)

https://github.com/YunoHost-Apps/pixelfed_ynh/blob/931cb347dd88e26e1f35a74e2586447d8a22dddb/scripts/remove#L61

We should check if we are on stretch before removing php :-)

https://github.com/YunoHost-Apps/pixelfed_ynh/blob/931cb347dd88e26e1f35a74e2586447d8a22dddb/scripts/remove#L61

Fixed at: https://github.com/YunoHost-Apps/pixelfed_ynh/blob/1de3d4e1d751da57b5170787d92a9a62ba4c8664/scripts/remove#L61-L63