Fix configure_and_run make < 4.3
#63
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make < 4.3 cannot work with annoymous pipe jobserver that has `O_NONBLOCK` set. This PR fixes it by clearing `O_NONBLOCK` in `configure_and_run` just before `exec`. Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
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make < 4.3 cannot work with annoymous pipe jobserver that has
O_NONBLOCKset.This PR fixes it by clearing
O_NONBLOCKinconfigure_and_runjust beforeexec.