update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

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parameter-config=testsprite2_blendmodes.parameters 
variator=exhaustive 
sutapp=testsprite2 
timeout=00:00:15 
action-config=testsprite2_blendmodes.actions