FreeBSD/ports 1983822 (r496300)www/unit-go Makefile

Be more specific with go cache to fix the failed build.

<BuildLog>
GOPATH=/wrkdirs/usr/ports/www/unit-go/work go build nginx/unit
failed to initialize build cache at /nonexistent/.cache/go-build: mkdir /nonexistent: permission denied
</BuildLog>

Do not bump PORTREVISION.
DeltaFile
+2-2www/unit-go/Makefile
+2-21 files

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