Auto-sync with upstream branch master
    
    Upstream commit: 85188d8211698d1a255f0aec6529546db5c56de3
    
    - Remove support for PowerPC SPE extension
    - elf: Add tst-ldconfig-bad-aux-cache test
    - Add F_SEAL_FUTURE_WRITE from Linux 5.1 to bits/fcntl-linux.h
    - nss_dns: Check for proper A/AAAA address alignment