FredBezies  filed a deletion request for linux-bld :
Obsolete and kernel version.
 https://aur.archlinux.org/account/FredBezies/  https://aur.archlinux.org/pkgbase/linux-bld/
Request #15862 has been accepted by polyzen :
Maybe someone wants to build 4.18 sometime, if this package is
deleted never could.
The repo doesn't get deleted and can still be cloned and what-not.