cmd/dist: enable cgo for freebsd/arm

Change-Id: Icc1a54da848bf446919c0d5470d1e79fad339832
Reviewed-on: https://go-review.googlesource.com/c/go/+/171727Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/dist/build.go

@@ -1485,7 +1485,7 @@ var cgoEnabled = map[string]bool{
 	"dragonfly/amd64": true,
 	"freebsd/386":     true,
 	"freebsd/amd64":   true,
-	"freebsd/arm":     false,
+	"freebsd/arm":     true,
 	"linux/386":       true,
 	"linux/amd64":     true,
 	"linux/arm":       true,