Now "fedpkg prep" command is generating a directory with the "-build"
suffix containing the build directory inside. We need to extract it.
Real example:
If the script is used for a branch related to nm-1-46, the "fedpkg prep"
command will generate a NetworkManager-1.46-build/ directory containing
the NetworkManager-1.46/ sources directory. We just need to move the
NetworkManager-1.46/ out.
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