benchmarks: Compare the same thing and add "raw-call.pl"

Create a new "raw-call.pl" benchmark that simply runs binmode without
any autodie/Fatal.  This can be used to determine the "best obtainable
speed".  Furthermore synchronise call.pl and leak.pl
(i.e. Fatal_Leaky_Benchmark.pm) so they call the same thing (and the
same number of times).  This makes it a lot easier to compare the
results between the 3 files.

Signed-off-by: Niels Thykier <niels@thykier.net>