lang/go: switch to the new bootstrap, add aarch64 support

[dmgk]

Summary

• Switch to the new bootstrap that supports freebsd/arm64
• Sync with lang/go-devel port (add new makesum target, switch to dynamic pkg-plist generation)

Test Plan

Tested locally on 12.1-STABLE amd64, i386 and aarch64
exp-run?

[dmgk]

Remove commented out SHEBANG_LANG

[tobik]

• exp-run is probably not needed for this update, but should maybe happen when 1.14 is released
• This looks like lang/go-devel now. Maybe it could be made a slave of lang/go later.
• Ever considered creating a [e-mail] maintainer group?

lang/go/Makefile

99–106

do-install, post-install could be merged and the two .for loops too.

115–126

Similar to rP523409 in lang/rust, ${GREP} ${GOARCH_${arch}:U${arch}} ${DISTINFO_FILE}.${arch} >> ${DISTINFO_FILE}.tmp can be simplified to ${SED} 1d ${DISTINFO_FILE}.${arch} >> ${DISTINFO_FILE}.tmp. The awk command below takes care of removing duplicate lines afterwards.

[dmgk]

lang/go/Makefile

115–126

I've fixed this in lang/go-devel, will update this review when go1.14 is out.

[dmgk]

Update for go1.14

[dmgk]

Bump PORTREVISION

[dmgk]

Exp-run PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244494

[mikael]

lang/go/Makefile

55

Do you plan to regenerate the bootstrap based on a release version?

68

This should be 1200086
https://github.com/freebsd/freebsd/blob/releng/12.0/sys/sys/param.h#L63

You can even put 12.1 since 12.0 is EOL on February 29, 2020

[dmgk]

lang/go/Makefile

55

Yes, but I'd like to get this committed first. After that, I'll update both Go ports, and there's also https://reviews.freebsd.org/D23063 that was waiting for go1.14