SB2 Bug using std::filesystem

Now, akshually.

A typical FM is e.g. (WARNING) moc[5815/-143018176] Path not found for FD 3, for __fxstatat64()

The ‘Path not found’ comes from here, and we can see the third parameter is empty. Which means virtual_path must have been ‘\0’, and this jumps to the error handling. (Also the weird indentation hints at some merge error or so).

PR21 to scratchbox seems to deal with errors in this space.
Can someone test whether an sb2 binary with that applied fares better compiling Qt stuff?

I don’t think I can update the sb2 package from within an OBS project, right?