benchs: remove old nitc related benchs

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: compile last nitg from bin/nitg

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: rename bench_nitg-g_options-hardening to slower

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: fix bench_compilation_time

Signed-off-by: Jean Privat <jean@pryen.org>
benchs: provide .gitignore to ignore generated files

Signed-off-by: Jean Privat <jean@pryen.org>
Merge branch 'benchs'

the `benchmarks/bench_engines.sh` script was not updated for the
*killnitc* transition.

This series cleaup the file, making it usable again.