systemd: provide -dev as elogind-dev

systemd-dev includes headers for logind and Alpine packages depending on
these headers specify elogind as dependency.

Closes: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/issues/3640

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6381

extra-repos/systemd/systemd/APKBUILD

@@ -9,7 +9,7 @@
 pkgname=systemd
 pkgver=257.7
 _pkgver="musl-v${pkgver//_/-}-split-usr"
-pkgrel=0
+pkgrel=1
 pkgdesc="System and service manager"
 url="https://github.com/systemd/systemd"
 # ppc64le and s390x blocked by pmboostrap not supporting
@@ -432,7 +432,7 @@ x11() {
 }
 
 dev() {
-	provides="eudev-dev udev-dev systemd-stage0-dev=$pkgver-r$pkgrel"
+	provides="eudev-dev udev-dev elogind-dev systemd-stage0-dev=$pkgver-r$pkgrel"
 	provider_priority=100
 
 	default_dev