Sync with upstream branch release/2.34/master
    
    Upstream commit: 75b0edb7ef338084e53925139ae81fb0dfc07dd4
    
    - Update NEWS file in the right place
    - Linux: Support __IPC_64 in sysvctl *ctl command arguments (bug 29771)
    - io: Fix use-after-free in ftw [BZ #26779]
    - io: Fix ftw internal realloc buffer (BZ #28126)
    - regex: fix buffer read overrun in search [BZ#28470]
    - regex: copy back from Gnulib
    - Allow #pragma GCC in headers in conformtest
    - Fix memmove call in vfprintf-internal.c:group_number
    - mktime: improve heuristic for ca-1986 Indiana DST
    - Makerules: fix MAKEFLAGS assignment for upcoming make-4.4 [BZ# 29564]
    - linux: Fix generic struct_stat for 64 bit time (BZ# 29657)
    - elf: Do not completely clear reused namespace in dlmopen (bug 29600)
    - nss: Use shared prefix in IPv4 address in tst-reload1
    - nss: Fix tst-nss-files-hosts-long on single-stack hosts (bug 24816)
    - nss: Implement --no-addrconfig option for getent