systemd/systemd: adds libbz2 dependency

Before this change, systemd package depends on other compression
libraries, but does not depend on libbz2. Let's also make it depend
on libbz2.

This also makes bzip2-dev explicitly installed on build, like other
compression libraries like lz4-dev, xz-dev, zlib-dev, and zstd-dev.
Currently, it is indirectly installed as glib-dev depends on it.
So the makedepends= change does not effectively changes anything.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8926>

extra-repos/systemd/systemd-stage0/APKBUILD

@@ -6,7 +6,7 @@ pkgname=systemd-stage0
 pkgver=261
 _pkgver="${pkgver/_/-}"
 # pkgrel must match systemd!
-pkgrel=0
+pkgrel=1
 pkgdesc="Minimal systemd bootstrap package"
 url="https://github.com/systemd/systemd"
 # armhf: pmb#2618

extra-repos/systemd/systemd/APKBUILD

@@ -17,7 +17,7 @@ pkgname=systemd
 pkgver=261
 _pkgver="${pkgver/_/-}"
 # pkgrel must match systemd-stage0!
-pkgrel=0
+pkgrel=1
 pkgdesc="System and service manager"
 url="https://github.com/systemd/systemd"
 # armhf: no linux-stable
@@ -54,6 +54,7 @@ makedepends="
 	bash
 	bash-completion
 	bpftool
+	bzip2-dev
 	clang
 	cmake
 	coreutils
@@ -66,7 +67,6 @@ makedepends="
 	kmod-dev
 	libapparmor-dev
 	libarchive-dev
-	libbz2
 	libbpf-dev
 	libcap-dev
 	libfido2-dev
@@ -133,6 +133,7 @@ depends="
 	libarchive
 	libblkid
 	libbpf
+	libbz2
 	libcap2
 	libdw
 	libelf