WAM: Fails with latest emscripten

[olilarkin]

SInce this change in emscripten, WASM decoding in the audioworklet fails due to no atob

IPlugEffect-web.js:1 Synced from IDBFS...
IPlugEffect-web.js:1 Synced to IDBFS...
index.html:169 AudioWorklet Supported
IPlugEffect-wam.js:2 Uncaught ReferenceError: atob is not defined
    at intArrayFromBase64 (IPlugEffect-wam.js:2:3337)
    at tryParseAsDataURI (IPlugEffect-wam.js:2:3540)
    at getBinarySync (IPlugEffect-wam.js:2:97219)
    at instantiateSync (IPlugEffect-wam.js:2:97525)
    at createWasm (IPlugEffect-wam.js:2:98136)
    at IPlugEffect-wam.js:2:124377
intArrayFromBase64 @ IPlugEffect-wam.js:2
tryParseAsDataURI @ IPlugEffect-wam.js:2
getBinarySync @ IPlugEffect-wam.js:2
instantiateSync @ IPlugEffect-wam.js:2
createWasm @ IPlugEffect-wam.js:2
(anonymous) @ IPlugEffect-wam.js:2
wam-processor.js:35 Uncaught TypeError: WAM.cwrap is not a function
    at new WAMProcessor (wam-processor.js:35:24)
    at new IPlugEffect_AWP (IPlugEffect-awp.js:8:5)
WAMProcessor @ wam-processor.js:35
IPlugEffect_AWP @ IPlugEffect-awp.js:8