There is no difference between these as far as the suspend/resume
functions go; the exiting difference is due to using a more
modern API for the jspi implementation.
Replace EM_JS() usage with EM_ASYNC_JS(). This allows using
await Promise() instead of Asyncify.handleSleep(), and also
removes the need for setting ASYNCIFY_IMPORTS.
Remove the useJspi() function and the duplicate code paths.
Task-number: QTBUG-129746
Change-Id: Id914089868763a1a3d5d575043c29845889f6624
Reviewed-by: Lorn Potter <lorn.potter@qt.io>
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
9a2370e434