[Bug 209706] imgact_binmisc.ko: add support for kern_alternate_path(9)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209706

            Bug ID: 209706
           Summary: imgact_binmisc.ko: add support for
                    kern_alternate_path(9)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: feature, needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: sbruno at FreeBSD.org

To facilitate mixing foreign executables with native in scripts image
activators need to support path translation similar to linuxulator. This would
make dynamic ELF executables able to find rtld(1) for their ABI without chroot.
Once implemented the path can configured via an optional argument to
binmiscctl(8).

  $ /compat/linux/bin/date
  Mon May 22 22:17:47 UTC 2016

  $ /poudriere/jails/head-aarch64/bin/date
  Unable to load interpreter

vs.

  $ sudo chroot /poudriere/jails/head-aarch64 /bin/date
  Mon May 22 22:17:47 UTC 2016

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