x/mobile: Unable to build basic sample with stripped NDK

[nikolay-turpitko]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?

   go version go1.6.2 linux/amd64
   

2. What operating system and processor architecture are you using (go env)?

   GOARCH="amd64"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="amd64"
   GOHOSTOS="linux"
   GOOS="linux"
   GOPATH="/home/nick/go"
   GORACE=""
   GOROOT="/home/nick/.local/share/umake/go/go-lang"
   GOTOOLDIR="/home/nick/.local/share/umake/go/go-lang/pkg/tool/linux_amd64"
   GO15VENDOREXPERIMENT="1"
   CC="gcc"
   GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
   CXX="g++"
   CGO_ENABLED="1"
   
   Ubuntu 16.04 LTS
   4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:27:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
   

3. 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.

   $ go get golang.org/x/mobile/cmd/gomobile
   $ gomobile init
   $ go get -d golang.org/x/mobile/example/basic
   $ gomobile build -target=android golang.org/x/mobile/example/basic
   

4. What did you expect to see?

Build should complete without error messages.

1. What did you see instead?

   gomobile: /home/nick/go/pkg/gomobile/android-ndk-r12/x86/bin/i686-linux-android-nm /tmp/gomobile-work-840948909/lib/x86/libbasic.so: fork/exec /home/nick/go/pkg/gomobile/android-ndk-r12/x86/bin/i686-linux-android-nm: no such file or directory
   

Comment: there is no such a file indeed. But when I changed mobile/cmd/gomobile/init.go line 31 (var useStrippedNDK = true) to var useStrippedNDK = false, re-compiled, re-init and re-build sample, it was able to build it. And indeed i686-linux-android-nm is now in place.

[hyangah]

duplicate of #16268