\Symfony\Component\Process\Process refuses being passed a string
with version > 5, which is installed with PHP > 7.2.5.
It also refuses being passed an array with version < 3.3, which is
installed with PHP < 5.5.9.
Solved by checking if Process::fromShellCommandLine() exists, which
was introduced in version 4.2.0.
072c3bfdb3