Diffusion Krita 5ddbfc6d4a44

Revert "Fix compilation on compilers which do not have Atomic built-in"

Authored by rempt on Oct 21 2018, 9:06 AM.

Description

Revert "Fix compilation on compilers which do not have Atomic built-in"

This reverts commit c2ea92c55535f00cf72661680e1ee8fb10116d74.

Reverting for now because it causes problems on macos and freebsd.