Issue #3678: Remove wrappers and call foreign functions directly
Remove implicit stack attributes and add a lint
Add externfn macro and correctly label fixed_stack_segments
Add fixed_stack_segment annotations for std tests
Add fixed_stack_segment annotations for libextra tests
Update ffi tutorial
Fix denyg, patch FIXME numbers
Add some mac-specific fixed_stack_segment annotations
Fix missing fixed_stack_segment in freebsd
Add fixed_stack_segment attributes for Windows