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Since init become dynamically linked, reroot appeared to be broken
because init copies itself into a transient tmpfs mount to continue
controlling execution right after the reboot(REROOT) syscall. Because
the binary is dynamically linked, it cannot be properly executed.
Provide a minimal static binary 'reroot_seed' embedded into the init as
byte stream, which performs what the 'init -r' did, namely, the second
phase reroot.
For the static build of init as part of the /rescue crunch, keep the
inline reroot code.
Reported and tested by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58164
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