configure: Don't write .pyc files by default (python -B)
When a Python script is run, Python normally writes bytecode into a .pyc file. QEMU's build process uses several Python scripts which are called from configure or make. The generated .pyc files take disk space without being of much use, because those scripts are short, not time critical and only called a few times. Python's option -B disables writing of .pyc files. QEMU now uses "python -B" as default, but it is still possible to choose a different call by passing --python=PYTHON to configure. Signed-off-by: NStefan Weil <sw@weilnetz.de> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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