Update systemd to version 249.7 / rev 343 via SR 945520
    
    https://build.opensuse.org/request/show/945520
    by user fbui + dimstar_suse
    - Added patches to fix CVE-2021-3997 (bsc#1194178)
      5000-shared-rm_rf-refactor-rm_rf_children_inner-to-shorte.patch
      5001-shared-rm_rf-refactor-rm_rf-to-shorten-code-a-bit.patch
      5002-shared-rm-rf-loop-over-nested-directories-instead-of.patch
      These patches will be dropped and cherry-picked from upstream once upstream
      will commit them in their main branch.
    
    - Import commit a54f80116ccf105dff11aef5d18dd110ebd3e8ee
      30cbebc56f tmpfiles: 'st' may have been used uninitialized
      5443654ec0 macro: add new helper RET_NERRNO()
      8d90ecc435 rm-rf: optionally fsync() after removing directory tree
      591344010d rm-rf: refactor rm_rf_children(), split out body of directory iteration loop
      8c7762c4f1 Bump the max number of inodes for /dev to a million (bsc#1192858)
      dc9476c881 journal: don't rem