Fix go 1.6 "cgo argument has Go pointer to Go pointer" error #41
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In 1.6, new rules are introduced for passing pointers between C and Go, you can read more about it here golang/go#12416. The current test suite fails under the new rules:
$ go test 2016/03/13 01:21:32 CodecCtx is successfully created and opened. --- FAIL: TestCodecCtx (0.00s) panic: runtime error: cgo argument has Go pointer to Go pointer [recovered] panic: runtime error: cgo argument has Go pointer to Go pointer
The pull request fixes that.