Removing test-driver symlink in ios third party install script

Summary:
After execution of `scripts/ios-install-third-party.sh` a symlink is created :
`<YOUR-APP-PATH>/node_modules/react-native/third-party/glog-0.3.4/test-driver`
that is pointing to `test-driver -> /usr/share/automake-1.14/test-driver`
This can be executed indirectly by `react-native run-ios`.

This breaks the bundle process if the system don't contain a given file under the link and having this strict dependency on the system setup is not a good practice.

Once the `test-driver` symlink is created android app release is failing, for :
`./gradlew assembleRelease`
the `:app:bundleReleaseJsAndAssets` returns :
```
FAILURE: Build failed with an exception.

* What went wrong:
Could not list contents of '<YOUR-APP-PATH>/node_modules/react-native/third-party/glog-0.3.4/test-driver'. Couldn't follow symbolic link.
```
Related issues:
https://github.com/facebook/react-native/issues/14417
https://github.com/facebook/react-native/issues/14464
https://github.com/facebook/react-native/issues/14548

1. Create new project with `react-native init <YOUR-APP>`
2. cd `<YOUR-APP>/`
3. Run app on iOS `react-native run-ios` so `scripts/ios-install-third-party.sh` is executed.
4. cd `android/`
5. Run android app release `./gradlew assembleRelease` (it will work properly after this fix and fail if the `test-driver` symlink exists)

IMHO we should resolve the issue with this quick fix and apply the proper fix later after the new version of `google/glog` will be released.
The proper cleanup of files generated by autotools was already applied : https://github.com/google/glog/pull/188

Please let me know if I should provide more details : javache, mhorowitz, hramos
Closes https://github.com/facebook/react-native/pull/14638

Differential Revision: D5292362

Pulled By: javache

fbshipit-source-id: 81ff2273420ea078d624a76e781a5b67b96e6a4e

scripts/ios-configure-glog.sh

@@ -7,6 +7,11 @@ CURRENT_ARCH="${CURRENT_ARCH:-armv7}"
 export CC="$(xcrun -find -sdk $PLATFORM_NAME cc) -arch $CURRENT_ARCH -isysroot $(xcrun -sdk $PLATFORM_NAME --show-sdk-path)"
 export CXX="$CC"
 
+# Remove automake symlink if it exists
+if [ -h "test-driver" ]; then
+    rm test-driver
+fi
+
 ./configure --host arm-apple-darwin
 
 # Fix build for tvOS