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chroot/mount: create /dev/fd

clayton craft requested to merge fd_symlink into master

Specifically, this fixes issues with process substitution in bash in the chroot.

For example, the following lines from a NetworkManager build script:

... |
    grep -Fx -f <(get_symbols_explicit) -v |
    grep -Fx -f <(get_symbols_nm)

fail with:

 ninja: job failed: /home/pmos/build/src/NetworkManager-1.35.92/tools/create-exports-NetworkManager.sh --called-from-build /home/pmos/build/src/NetworkManager-1.35.92
 grep: /dev/fd/63: No such file or directory
 grep: /dev/fd/63: No such file or directory

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