[Bug libc/22134] [linux] implement fexecve with execveat

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https://sourceware.org/bugzilla/show_bug.cgi?id=22134

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=43ffc53a352a67672210c9dd4959f6c6b7407e60

commit 43ffc53a352a67672210c9dd4959f6c6b7407e60
Author: Andreas Schwab <schwab@suse.de>
Date:   Wed Sep 6 17:29:29 2017 +0200

    Use execveat syscall in fexecve (bug 22134)

    By using execveat we no longer depend on /proc.  The execveat syscall was
    introduced in 3.19, except for a few late comers.

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Summary of changes:
 ChangeLog                                          |   18 ++++
 posix/Makefile                                     |    2 +-
 posix/tst-fexecve.c                                |   88 ++++++++++++++++++++
 sysdeps/unix/sysv/linux/alpha/kernel-features.h    |    5 +
 sysdeps/unix/sysv/linux/fexecve.c                  |   15 ++++
 sysdeps/unix/sysv/linux/hppa/kernel-features.h     |    5 +
 sysdeps/unix/sysv/linux/kernel-features.h          |    5 +
 .../unix/sysv/linux/microblaze/kernel-features.h   |    5 +
 8 files changed, 142 insertions(+), 1 deletions(-)
 create mode 100644 posix/tst-fexecve.c

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