Minor build cleanups and fix a harmless race condition in the OPFS part of tester1.js.
FossilOrigin-Name: 70ee6ee014bc4e2c1daa9b4a8909cf76ccecf32de1eb39055f20d3d0b1daa1bd
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stephan committed
de6186e04f96ddca46ab6a100b954a5db300fa1c
Parent: 2cdcc7f