change refcount, avoid ShmMsgQueue AddRef on send.

lichao

2021-05-14 c0d61292ef6bdd8e2e93525b5df6a8ec5c017c32

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module basic.com/valib/bhshmq.git
 
go 1.14
 
require github.com/gogo/protobuf v1.3.2 // indirect