fixup! git tag --contains : avoid stack overflow

It seems that ulimit -s cannot work on windows (msys nor cygwin).
Let's skip the test there.
In a good Autoconf tradition, we test the particular feature.

@dscho, if you get to this, what about resolving the parameters?  (I could then re-submit the patch to git list.)

As the test is going to be skipped on Windows, we can as well live with ulimit -s 64 and 4000 commits,
as @Peff proposed.

Signed-off-by: Stepan Kasal <kasal@ucw.cz>