Auto-sync with upstream branch release/2.26/master
    
    Upstream commit: af7519f7b35024224c163e32a89fb247b0c446fc
    
    - Fix path length overflow in realpath (swbz#22786)
    - Fix stack overflow with huge PT_NOTE segment (swbz#20419)
    - Fix signed integer overflow in random_r (swbz#17343)
    - i386: Fix i386 sigaction sa_restorer initialization (swbz#21269)
    - nscd: Fix netgroup cache keys (swbz#22342)
    - Fix i386 memmove issue (swbz#22644)
    - Fix crash in resolver on memory allocation failure (swbz#23005)
    - getlogin_r: return early when linux sentinel value is set (swbz#23024)
    - resolv: Fully initialize struct mmsghdr in send_dg (swbz#23037)