x/mobile: gomobile bind fails to find cgo library

[onthest...@gmail.com]

It seems like "gomobile" bind command cannot find CGO libraries. 

I enabled CGO, and still, the issue remains the same.

I would really appreciate it if someone could help me with this matter.

### What version of Go are you using (`go version`)?

<pre>

    $ go version

    go version go1.14.1 darwin/amd64

</pre>

### Does this issue reproduce with the latest release?

Yes

### What operating system and processor architecture are you using (`go env`)?

    $ go env

    

    GO111MODULE=""

    GOARCH="amd64"

    GOBIN=""

    GOCACHE="/Users/younseo/Library/Caches/go-build"

    GOENV="/Users/younseo/Library/Application Support/go/env"

    GOEXE=""

    GOFLAGS=""

    GOHOSTARCH="amd64"

    GOHOSTOS="darwin"

    GOINSECURE=""

    GONOPROXY=""

    GONOSUMDB=""

    GOOS="darwin"

    GOPATH="/Users/younseo/go"

    GOPRIVATE=""

    GOPROXY="https://proxy.golang.org,direct"

    GOROOT="/usr/local/opt/go/libexec"

    GOSUMDB="sum.golang.org"

    GOTMPDIR=""

    GOTOOLDIR="/usr/local/opt/go/libexec/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/yq/4rz_9mts3w725cccjrp66pxm0000gn/T/go-build490416867=/tmp/go-build -gno-record-gcc-switches -fno-common"

</pre></details>

### What did you do?

    $gomobile bind -target ios

    $gomobile bind -target android

### What did you expect to see?

*.arr, *.jar, Framework files being generated 

### What did you see instead?

gomobile bind failed to find cgo libraries.  

[![enter image description here][1]][1]

  [1]: https://i.stack.imgur.com/0QCbn.png