stat: fix mount table read when /proc is unavailable #10300
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Only read mount information when needed (%m directive) and handle gracefully when /proc/self/mountinfo is not accessible, fixing stat failures in chroot environments without /proc mounted. see https://bugs.launchpad.net/ubuntu/+source/rust-coreutils/+bug/2133797
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Only read mount information when needed (%m directive) and handle gracefully when /proc/self/mountinfo is not accessible, fixing stat failures in chroot environments without /proc mounted.
see https://bugs.launchpad.net/ubuntu/+source/rust-coreutils/+bug/2133797