[Bug 289739] linuxemu path translation fails for ELF interpreter being a absolute symlink

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289739

            Bug ID: 289739
           Summary: linuxemu path translation fails for ELF interpreter
                    being a absolute symlink
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: nimaje+fbz@bureaucracy.de

When creating a linux userland via debootstrap the default ELF interpreter is
an absolute symlink to the real ELF interpreter. And when pointing
compat.linux.emul_path to that userland and trying to run any ELF executable
from it, it results in:

ELF interpreter /lib64/ld-linux-x86-64.so.2 not found, error 2

After changing that absolute symlink to a relative one, the executable works
fine.

This suggests path translation didn't get triggered again for the absolute
symlink and only the root file system gets searched for it, but not under
compat.linux.emul_path.

Fixing this would allow userlands created via debootstrap to be used directly
on the host without chroot, for usecases where you don't want that seperation.

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