veyron/tools/gclogs: Enable test on darwin

With go1.4, this test should work fine now.

Change-Id: Icfa201c75d629887a4bd23366b1bbd0d8d0f1b33
diff --git a/tools/gclogs/gclogs_test.go b/tools/gclogs/gclogs_test.go
index 0454df5..574fca2 100644
--- a/tools/gclogs/gclogs_test.go
+++ b/tools/gclogs/gclogs_test.go
@@ -1,9 +1,5 @@
-// +build -darwin
-
 package main
 
-// These tests need go 1.4 to run successfully on a mac.
-
 import (
 	"bytes"
 	"fmt"