Simplified executable file formats

src/exe/macho/macho.md

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+# Mach-O
+
+## Notes
+
+MacOS is the only operating system that requires loading the headers
+explicitly with both readable and executable permissions.
+
+## Loader
+
+https://github.com/apple-oss-distributions/xnu/blob/main/EXTERNAL_HEADERS/mach-o/loader.h
+
+## Links
+
+- https://en.wikipedia.org/wiki/Mach-O
+- https://github.com/aidansteele/osx-abi-macho-file-format-reference
+- https://stackoverflow.com/questions/39863112/what-is-required-for-a-mach-o-executable-to-load