d15f4e8 Auto-sync with upstream branch release/2.29/master

Authored and Committed by fweimer 4 years ago
    Auto-sync with upstream branch release/2.29/master
    
    Upstream commit: ea6f2c3174232ca7f66ab1524f0d5fedc7b26f23
    
    - <string.h>: Define __CORRECT_ISO_CPP_STRING_H_PROTO for Clang (swbz#25232)
    - x86: Assume --enable-cet if GCC defaults to CET (swbz#25225)
    - libio: Disable vtable validation for pre-2.1 interposed handles (swbz#25203)
    - CVE-2019-19126: LD_PREFER_MAP_32BIT_EXEC not ignored for SUID programs
      (#1774682)
    
        
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