Unify the settings for single-threaded and multi-threaded builds;
Qt now always enables heap growth by default.
This means we don't have to reserve a large (1GB) fixed memory
size, but can instead set the smaller (50 MB) initial memory size,
like the single-threaded build does.
Enabling threads + memory growth can potentially cause
a performance regression when accessing heap memory from
JavaScript (https://github.com/WebAssembly/design/issues/1271).
We leave it for the application to decide if this applies,
and if the switch to fixed memory should be made.
Change-Id: I96988b072506456685086e55aca4007a146bd70f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
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