4036357 Auto-sync with upstream branch release/2.27/master

Authored and Committed by fweimer 5 years ago
    Auto-sync with upstream branch release/2.27/master
    
    Upstream commit: 80c83e91140d429c73f79092fdb75eed0fb71da0
    
    - libio: Avoid _allocate_buffer, _free_buffer function pointers (swbz#23236)
    - posix: Fix posix_spawnp to not execute invalid binaries in non compat mode
      (swbz#23264)
    - elf: Improve DST handling (swbz#23102, swbz#21942, swbz#18018, swbz#23259)
    
        
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