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Build tensorflow-for-poets only if tensorflow 1.x is available,
otherwise skip it with message:
...
ERROR: Nothing PROVIDES 'tensorflow-for-poets' tensorflow-for-poets was skipped:
It requires tensorflow 1.x, add 'TF_ARGS_EXTRA = "--config=v1"' to local.conf
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Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>