b8873c0 Auto-sync with upstream branch master

Authored and Committed by fweimer 5 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: 7b36d26b22d147ffc347f427f9fd584700578a94
    
    - CVE-2018-19591: if_nametoindex: Fix descriptor for overlong name (#1654000)
    - Mutex: Add pthread mutex tunables
    - stdlib: assert on NULL function pointer in atexit etc. (swbz#20544)
    - Enable VDSO on i386 statically linked programs
    - posix: Use posix_spawn on system
    - posix: Use posix_spawn on popen (swbz#17490, swbz#22834)
    - Fix _dl_profile_fixup data-dependency issue (swbz#23690)
    - Enable VDSO for static linking on aarch64
    
        
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