3.19.2

Bug fixes:

• Show a warning instead of failing if a Mach-O file is prouduced by a build running on a platform other than macOS (#3912)
• Revert #3893, restores behavior of build/binary_has_prefix_files to that found in 3.18.12 (#3916)

Docs:

• clarified 'deletes the build environment' in concepts/recipe.rst (#3901)

Contributors:

• @jjhelmus
• @timsnyder
• @chrisburr