Support options configuration from environment and sample_config.h. It'll search environment first. It it's empty, then use configurations in sample_config.h.
Fix cmake version compatible issue in ingenic T31 sample.
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sample_config.h. It'll search environment first. It it's empty, then use configurations insample_config.h.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.