Instead of hardcoding the maximum number of arguments to the
my_system helper, pass a variable argument list.
The function is deliberately source-incompatible with the old
implementation (as opposed to a variant with a sentinel NULL
argument, which would be compatible) to find all users and to
make sure that new future users of this function are not
overlooked during merges with other branches.
Signed-off-by: Jacek Jendrzej <crashdvb@googlemail.com>
