Use no async threads for erlc
Merge branch 'rickard/async-default/OTP-10736'

* rickard/async-default/OTP-10736:
  Use no async threads for erlc
Fix unmanaged thread progress delay
Fix spelling in communication.xml

Thanks to Richard O'Keefe
Merge branch 'rickard/r16/port-optimizations/OTP-10336'

* rickard/r16/port-optimizations/OTP-10336:
  Fix spelling in communication.xml
  Fix unmanaged thread progress delay
Revert "Prepare release"

This reverts commit a0e362765d9d4afb0211f49eb787d2139b3eb7be.

Conflicts:

	erts/vsn.mk
Prepare release
Update version numbers