systemd: udev: explicitly depend on kmod-lib

This fixes an issue where the mkosi-generated initrd fails to load udev
because libkmod is not installed when systemd-udevd is installed.

For pmOS installs/initramfs stuff, this change should be a no-op,
libkmod is already pulled in by other things and our initramfs config
includes the library manually.

[ci:skip-build]: already built successfully in CI

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7079>

extra-repos/systemd/systemd/APKBUILD

@@ -9,7 +9,7 @@
 pkgname=systemd
 pkgver=257.8
 _pkgver="musl-v${pkgver//_/-}-split-usr"
-pkgrel=1
+pkgrel=2
 pkgdesc="System and service manager"
 url="https://github.com/systemd/systemd"
 # ppc64le and s390x blocked by pmboostrap not supporting
@@ -263,6 +263,10 @@ udevd() {
 	pkgdesc="systemd udev"
 	# is a dependency of systemd
 
+	# Some lib dependencies can't be automatically detected because they are
+	# dlopened and must be explicitly listed
+	depends="kmod-libs"
+
 	# NOTE: should only be udev, but packages hardcode eudev
 	provides="eudev udev eudev-libs"
 	provider_priority=100