Muflone [1] filed a deletion request for remmina-plugin-exec [2]:
Remmina package now includes an exec plugin so this package is not needed anymore.
[1] https://aur.archlinux.org/account/Muflone/ [2] https://aur.archlinux.org/pkgbase/remmina-plugin-exec/
Request #10715 has been accepted by Alad [1].
aur-requests@lists.archlinux.org