448365c Auto-sync with upstream branch master

Authored and Committed by fweimer 4 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: e3f454bac0f968216699ca405c127c858f0657c7
    
    - nss_dns: Do not replace root domain with empty string
    - alloc_buffer: Return unqualified pointer type in alloc_buffer_next
    - malloc: Set and reset all hooks for tracing (swbz#16573)
    
        
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