Comparing the in tree stored source file of sstrip suggests it's version
2.0[0], reflect that in the Makefile.
Motivation is the tracking of changes in the buildsystem, which requires
versioning of packages.
[0]: df4426a0f0 (diff-d3ba694d91432a068d5d3b36abf8cd0f)
Signed-off-by: Paul Spooren <mail@aparcar.org>
d2332e215e