4a003b4 Auto-sync with upstream branch master

Authored and Committed by djdelorie 4 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: 2bd81b60d6ffdf7e0d22006d69f4b812b1c80513.
    
    - szl_PL locale: Spelling corrections (swbz 24652).
    - nl_{AW,NL}: Correct the thousands separator and grouping (swbz 23831).
    - Add missing VDSO_{NAME,HASH}_* macros and use them for PREPARE_VERSION_KNOWN
    - nptl: Convert various tests to use libsupport
    - support: Invent verbose_printf macro
    - support: Add xclock_now helper function.
    
        
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