makechrootpkg: also downgrade packages when updating chroots

Packages should never be getting downgraded... unless a package is
pulled from testing, e.g. for example if gcc9 totally breaks the linux
kernel. In such cases, the master repo says there is a downgrade, so
we'd better go with that. Basically, ensure that packages match the repo
they are being built against. Consistency at all costs!

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

archbuild.in

@@ -71,7 +71,7 @@ else
 		-C "@pkgdatadir@/pacman-${repo}.conf" \
 		-M "@pkgdatadir@/makepkg-${arch}.conf" \
 		"${chroots}/${repo}-${arch}/root" \
-		pacman -Syu --noconfirm || abort
+		pacman -Syuu --noconfirm || abort
 fi
 
 # Always build official packages reproducibly

makechrootpkg.in

@@ -361,7 +361,7 @@ fi
 
 (( update_first )) && arch-nspawn "$copydir" \
 		"${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \
-		pacman -Syu --noconfirm
+		pacman -Syuu --noconfirm
 
 if [[ -n ${install_pkgs[*]:-} ]]; then
 	install_packages