Auto-sync with upstream release/2.26/master
    
    Upstream commit: 2aa1a7a8f8b9b7879bc6eb1c34d1580f992c406d
    
    - Disable SSE2 usage on i686 (#1471427)
    - assert: Suppress pedantic warning caused by statement expression (swbz#21242)
    - malloc: Avoid optimizer warning with GCC 7 and -O3 (#1470060)
    - nss: Call __resolv_context_put before early return in get*_r (swbz#21932)
    - x86-64: Use _dl_runtime_resolve_opt only with AVX512F (swbz#21871)
    - getaddrinfo: Release resolver context on error in gethosts (swbz#21885)