Auto-sync with upstream branch master
    
    Upstream commit: 85e6d8b4175fcb195011a0a1bad37d6f3b2355db
    
    - time: Fix use-after-free in getdate
    - Move {read,write}_all functions to a dedicated header
    - tests: Replace various function calls with their x variant
    - tests: fix warn unused result on asprintf calls
    - pthreads: Use _exit to terminate the tst-stdio1 test
    - support: Add delayed__exit (with two underscores)