build: convert to go:build directives #2664
Merged
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currently, CI fails on go master branch.
as mentioned in golang/go#41184 and golang/go#44505, Go will probably migrate to a more robust build constraints directive, as explained design doc:
https://golang.org/s/go-build-design
so, we should prepare for that:
for Go-1.17: add all //go:build directives
for Go-1.18: remove all // +build directives