Convert manual v4 tests to auto tests

This would hopefully allow us to catch regressions like this one.

Quoting Simon on the topic of what is necessary to convert the manual tests into auto tests:

Basically upon git checkout of the module, it is necessary to initialize the sub-module with

git submodule update --checkout tests/manual/v4/test62

followed by qmake and make check and make check-interpreter in tests/manual/v4. This is probably best if Linux only at this point. And the result somehow would need to get propagated back.

Perhaps a "synthetic" auto-test could be used to implement this, which uses QProcess to run the necessary "shell" commands and capture the output. That would also make it easier to #ifdef for platform.