systemd: backport patches to fix CVE-2025-4598

systemd: backport patches to fix CVE-2025-4598

Patch 0003 is the actual patch to fix CVE.

Patch 0002 is a preparation patch which systemd upstream uses for
all actively maintained branches in preparation for patch 0003.

Patch 0001 is a bug fix patch and is needed to avoid conflict introduced
by patch 0002. Note that patch 0002 claims itself to be of no functional
change, so this patch 0001 is really needed for patch 0002.

Patch 0004 is a compilation fix patch which adds a macro needed by
previous 0002 patch.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>