M1 Mac build espruino

Here is a pull-request that builds /MacBook Pro (13-inch, M1, 2020)/, the espruino --tests-all doesn't crash and this is the output:

espruino:  355 of 359 tests passed
espruino: FAILS:
espruino: /Users/standa/Prg/espruino/Espruino/test­s/test_new_nested2_FAIL.js
espruino: /Users/standa/Prg/espruino/Espruino/test­s/test_262_FAIL.js
espruino: /Users/standa/Prg/espruino/Espruino/test­s/test_object_getOwnPropertyNames_FAIL.j­s
espruino: /Users/standa/Prg/espruino/Espruino/test­s/test_number_constructor_FAIL.js
espruino: ----------------------------------------­----------