x/mobile: gomobile init fails with renaming error

[rakyll]

gomobile init is consistently failing on darwin_amd64 with the following renaming error.

$ gomobile init -x
NDKCCPATH=/Users/jbd/pkg/gomobile/android-ndk-r10d
WORK=/Users/jbd/pkg/gomobile/android-ndk-r10d/gomobile-init-156150741
mkdir -p $WORK/go/pkg
cp -a $GOROOT/lib $WORK/go/lib
cp -a $GOROOT/src $WORK/go/src
ln -s $GOROOT/.git $WORK/go/.git
PATH=$HOME/Downloads/visualvm_138/bin:$HOME/Downloads/go_appengine:/usr/local/git/current/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin/g4bin:/usr/local/go/bin:/usr/local/go/bin:$HOME/bin:$GOROOTogle-cloud-sdk/bin:$GOROOTogle-cloud-sdk/bin:$HOME/bin:$GOROOT/bin GOOS=android GOARCH=arm GOARM=7 CGO_ENABLED=1 CC_FOR_TARGET=$NDKCCPATH/arm/bin/arm-linux-androideabi-gcc CXX_FOR_TARGET=$NDKCCPATH/arm/bin/arm-linux-androideabi-g++ TMPDIR=$WORK HOME=$HOME $WORK/go/src/make.bash --no-clean
mv $WORK/go/pkg/tool/darwin_amd64/5a $NDKCCPATH/arm/bin/5a
rm -r -f "$WORK"
gomobile: rename /Users/jbd/pkg/gomobile/android-ndk-r10d/gomobile-init-156150741/go/pkg/tool/darwin_amd64/5a /Users/jbd/pkg/gomobile/android-ndk-r10d/arm/bin/5a: no such file or directory