av1enc: enable row-mt property conditionally
The row based multi threading control was introduced after 1.0.0 version of libaom released. It adds a guard to check the relevant control definition declared. It is related with #1025 (closed)
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The row based multi threading control was introduced after 1.0.0 version of libaom released. It adds a guard to check the relevant control definition declared. It is related with #1025 (closed)