main/zfs-lts: fix install_if for zfs-virt

fixes #11603

main/zfs-lts/APKBUILD

@@ -4,7 +4,7 @@
 # when changing _ver we *must* bump _rel
 _name=zfs
 _ver=0.8.4
-_rel=0
+_rel=1
 
 _flavor=${FLAVOR:-lts}
 _kpkg=linux-$_flavor
@@ -94,7 +94,7 @@ package() {
 _extra() {
 	local flavor=${subpkgname##*-}
 	depends="linux-$flavor=$_kpkgver"
-	install_if="linux-$flavor=$_kpkgver"
+	install_if="zfs linux-$flavor=$_kpkgver"
 	pkgdesc="ZFS for Linux: kernel modules for $flavor"
 
 	kabi="$_kver-$_krel-$flavor"