A recent fix by Stefan Beller forces `git submodule` to use absolute
paths all around. This, however, breaks our tests because all of a
sudden, a relative path that was just barely within the maximal path
size now extends it as an absolute path.
A brief test on this developer's Windows 10 showed, though, that the
claim that "SetCurrentDirectoryW doesn't support long paths" does not
hold up to reality: simply lifting the limitation still works, and even
better: it lets t7413 pass (and it does not pass with Stefan's patch).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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