Repository: go
Issue: x/mobile: `go test golang.org/x/mobile/bind/objc` failed with Xcode 11.1
Labels: NeedsInvestigation,mobile

<!-- Please answer these questions before submitting your issue. Thanks! -->

### What version of Go are you using (`go version`)?

<pre>
$ go version
go version go1.13.1 darwin/amd64
</pre>

### Does this issue reproduce with the latest release?

Yes

### What operating system and processor architecture are you using (`go env`)?

<details><summary><code>go env</code> Output</summary><br><pre>
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/hajimehoshi/Library/Caches/go-build"
GOENV="/Users/hajimehoshi/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/hajimehoshi/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/ht/ky_bwgzs4bd5z1hh02k34x_h0000gn/T/go-build920015374=/tmp/go-build -gno-record-gcc-switches -fno-common"
</pre></details>

### What did you do?

<!--
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
-->

```
cd $(go env GOPATH)/src/golang.org/x/mobile
go test ./bind/objc/
```

### What did you expect to see?

The test passes

### What did you see instead?

The test fails for example

```
--- FAIL: TestObjcCustomPkg (49.76s)
    seq_test.go:116: tmpdir = /var/folders/ht/ky_bwgzs4bd5z1hh02k34x_h0000gn/T/bind-objc-seq-test-201072910
    seq_test.go:149: User defaults from command line:
            IDETestRunOnlyIdentifiers = (
            xcodetestTests
        )

        xcodebuild: error: Unable to find a destination matching the provided destination specifier:
                        { platform:iOS Simulator, OS:latest, name:iPhone 6s Plus }

                The requested device could not be found because no available devices matched the request.

                Available destinations for the "xcodetest" scheme:
                        { platform:iOS Simulator, id:1FBDEEDC-D891-47EE-A4E4-C9B5E902110C, OS:13.1, name:iPad Air (3rd generation) }
                        { platform:iOS Simulator, id:30824713-61F9-4BA7-A1EE-248DA40E4E27, OS:13.1, name:iPad Pro (9.7-inch) }
                        { platform:iOS Simulator, id:AF88039D-79C0-4483-8BBD-C30CC066DBEF, OS:13.1, name:iPad Pro (11-inch) }
                        { platform:iOS Simulator, id:0E1C991D-11C6-482A-B9E9-A053C7E91525, OS:13.1, name:iPad Pro (12.9-inch) (3rd generation) }
                        { platform:iOS Simulator, id:E0DB1DB4-2F99-44FA-8DC8-EDB96140E527, OS:13.1, name:iPhone 8 }
                        { platform:iOS Simulator, id:70D15E50-999C-4DAA-8C4A-1EBD680C0A2F, OS:13.1, name:iPhone 8 Plus }
                        { platform:iOS Simulator, id:22A966A1-9AE5-4BFE-9B1A-F7CAB1FACC37, OS:13.1, name:iPhone 11 }
                        { platform:iOS Simulator, id:8E935EFC-97B6-449A-B589-1B0ED3972246, OS:13.1, name:iPhone 11 Pro }
                        { platform:iOS Simulator, id:5F62606E-C1E5-4918-8930-4FCFA9CC8B19, OS:13.1, name:iPhone 11 Pro Max }

                Ineligible destinations for the "xcodetest" scheme:
                        { platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Generic iOS Device }
                        { platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Generic iOS Simulator Device }
    seq_test.go:150: failed to run xcodebuild: exit status 70
FAIL
FAIL    golang.org/x/mobile/bind/objc   206.323s
FAIL
```

```
$ xcodebuild -version
Xcode 11.1
Build version 11A1027
```

CC @hyangah