953a653 Auto-sync with upstream branch release/2.28/master

Authored and Committed by fweimer 5 years ago
    Auto-sync with upstream branch release/2.28/master
    
    Upstream commit: 58d2672f64176fcb323859d3bd5240fb1cf8f25c
    
    - malloc: Fix tcache count maximum (swbz#24531)
    - dlfcn: Guard __dlerror_main_freeres with __libc_once_get (once) (swbz#24476)
    - libio: Fix crash in _IO_wfile_sync (#1710460)
    
        
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