Julian Oes 177d14c8ea px_romfs_pruner.py: remove deprecation warning
The open flag `U` causes a deprecation warning starting with Python 3.4.
The option to open all kinds of newlines as `\n` has been replaced with
the argument `newline=None`. However, this argument is not available for
Python 2 unless we use `io.open` instead of `open`.
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