Fix build failure on Hurd due to wrong _PYTHON_SYSCONFIGDATA_NAME.
On Hurd, platform part in sysconfigdata name is gnu0, which is different from $DEB_HOST_ARCH_OS. So we add logic to handle the special case of Hurd.
Edited by Yuqian Yang
On Hurd, platform part in sysconfigdata name is gnu0, which is different from $DEB_HOST_ARCH_OS. So we add logic to handle the special case of Hurd.