fix macOS stack trace regression
fix macOS stack trace regression

f8f054b354088eb9e76d9207972022bc1d3dfc28 exposes the issue where
macho symbol `__mh_execute_header` is weak exported with an extra
underscore and stack traces fail due to invalid header magic.

related #2700

zig-lang/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig