syscall: use MustHaveExec in TestExec
For #41702 Change-Id: Ib2b15e52aa1fef2f5e644b316c726150252fa9f8 Reviewed-on: https://go-review.googlesource.com/c/go/+/262738 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Cherry Zhang <cherryyz@google.com>
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