update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

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00:00:02 SCREENSHOT # Take a screenshot of each window owned by the SUT process 
00:00:05 VERIFY # Verify each screenshot taken with verification images 
00:00:10 QUIT # Gracefully quit the SUT process