convert sample test to iscc test
The original sample test was added in
barvinok-0.28-21-g361d5103e0
(Polyhedron_Factor: handle polyhedra with a non-trivial lineality
space, Thu Apr 2 11:42:04 2009 +0200), before iscc was introduced.
Now that iscc is available, there is no need to use specialized code
in the test executable to test the results of sampling.
Instead, iscc can be used.
This also makes it easier to write new tests since they are
more uniform with other iscc based test cases.
Signed-off-by: Sven Verdoolaege <sven.verdoolaege@gmail.com>