net-dialup/isdn-firmware: set rpm.eclass var for reference rpm support

fix variableorder

Closes: https://bugs.gentoo.org/973254
Signed-off-by: Nicolas PARLANT <nicolas.parlant@parhuet.fr>
Part-of: https://codeberg.org/gentoo/gentoo/pulls/736
Signed-off-by: Sam James <sam@gentoo.org>

net-dialup/isdn-firmware/isdn-firmware-2011.8.29.8.37.ebuild

@@ -1,8 +1,9 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
+RPM_COMPRESS_TYPE=xz
 inherit rpm
 
 MY_PN="i4lfirm"
@@ -13,6 +14,7 @@ MY_P="${MY_PN}-${MY_PV}-${MY_PP}"
 DESCRIPTION="ISDN firmware for active ISDN cards (AVM, Eicon, etc.)"
 HOMEPAGE="https://www.isdn4linux.de/"
 SRC_URI="https://rsync.opensuse.org/distribution/leap/15.2/repo/oss/x86_64/${MY_P}.x86_64.rpm"
+S="${WORKDIR}/lib/firmware/isdn"
 
 LICENSE="freedist"		#446158
 SLOT="0"
@@ -21,8 +23,6 @@ KEYWORDS="amd64 ppc x86"
 # Bug #827318
 BDEPEND="app-arch/xz-utils[extra-filters(+)]"
 
-S="${WORKDIR}/lib/firmware/isdn"
-
 src_install() {
 	insinto $(get_libdir)/firmware
 	insopts -m 0644