make: Replace deprecated emcc configuration

EXTRA_EXPORTED_RUNTIME_METHODS is deprecated. Replace with
EXPORTED_RUNTIME_METHODS.
10 jobs for master in 4 minutes and 40 seconds (queued for 29 seconds)
Child pipeline (parent)
Status Name Job ID Coverage
  Build
passed build:python #13577

00:01:08

 
  Test
passed test:python: [3.6] #13578

00:01:45

passed test:python: [3.7] #13579

00:01:40

passed test:python: [3.8] #13580

00:02:13

passed test:python: [3.9] #13581

00:02:27

 
  Dist
passed dist:python:sdist #13582

00:00:39

passed dist:python:wheel: [3.6] #13583

00:00:37

passed dist:python:wheel: [3.7] #13584

00:00:42

passed dist:python:wheel: [3.8] #13585

00:00:53

passed dist:python:wheel: [3.9] #13586

00:01:02