Merge branch 'develop'

Revert "build: apply defect macro tests"

This reverts commit f8c1f30.

boost.context must still build for boost.coroutine

Merge branch 'master' of github.com:boostorg/context

Merge branch 'develop'

Merge branch 'develop'

Lift architecture detection

Merge branch 'develop'

Update architectures.qbk

Release 1.55.0

[SVN r86621]

Release 1.54.0

[SVN r84923]