bug#37732: mps-youtube propagates util-linux

[Diego Nicola Barbato]

Hi Guix,

An unfortunate chain of propagated-inputs causes 'util-linux' (mount,
umount, etc.) to be installed alongside 'mps-youtube': 'mps-youtube'
propagates 'python-pygobject', which propagates 'glib', which propagates
'util-linux'.  It seems to have been introduced with commit 6c237a2,
when 'util-linux' was moved to the propagated-inputs of 'glib'.

This is a problem on foreign distributions, where the stowaway 'mount'
and 'umount' commands installed by Guix shadow the setuid ones provided
by the distro.

I am currently on commit ecf3a3a (post core-updates merge).

Regards,

Diego