The kernel should reject such exec()s now, early on. Instead of adding
the needed boilerplate to write a test in C, just add an -n argument for
"(n)ull argv" to the execve helper and exec this other helper that just
exits silently with argv count.
Reviewed by: emaste, kib, markj (all previous version)
Differential Revision: https://reviews.freebsd.org/D34045
State that execve failed instead of just printing out the program name
and strerror(errno) via err(3).
MFC after: 3 days
X-MFC with: r312118
Sponsored by: Dell EMC Isilon
