Update architecture detection method

```
In some OS, obtaining the processor type from `uname - p` may fail.
For Golang programs, we should use `go env GOARCH` to obtain the architecture

=====================
$ go env GOARCH
amd64
$ uname -m
x86_64
$ uname -p
unknown
```

Signed-off-by: weidongkl <weidong@uniontech.com>

Makefile

@@ -11,7 +11,7 @@ GOBIN         = $(shell go env GOPATH)/bin
 endif
 GOX           = $(GOBIN)/gox
 GOIMPORTS     = $(GOBIN)/goimports
-ARCH          = $(shell uname -p)
+ARCH          = $(shell go env GOARCH)
 
 ACCEPTANCE_DIR:=../acceptance-testing
 # To specify the subset of acceptance tests to run. '.' means all tests