configure: Use -B switch only for Python versions which support it
Commit 1d984a67 added the -B switch unconditionally. This breaks Python versions before 2.6 which don't support that switch. Now configure adds -B only if it is accepted by the Python interpreter. This modification introduces a small incompatibility because -B might now also be added when configure was called with --python=PYTHON_INTERPRETER. Signed-off-by: NStefan Weil <sw@weilnetz.de> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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