* Add build tags to support both x86 and ARM compilation on macOS
* Documentation fix: command line for build under macOS
* Global replace 'macOS X' -> 'macOS'. Fix typo in -tags cmd line param
* `README.md`: fix all `--tags` -> `-tags`
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Co-authored-by: Denis Dmitriev <dmitriev@itspartner.net>
Fix: Placed all +build tags in the same location
Fix: Split CFLAGS, LDFLAGS into seperate lines for readability and lookup
Fix: Placed empty line between copyright comments and build tags for readability
Fix: Placed OS specfic cgo flags at the end if the cgo sections contains multiple lines.