fix(metadata-generator): Static frameworks from .o

[mbektchiev]

Take into account static frameworks composed of a single object file such as GoogleMaps.

Fix taken from: https://github.com/NativeScript/ns-v8ios-runtime/commit/f34d4e9e6b30edf567421167179e9014695dbcc9#diff-752cd2355f79b442571e27326e7bb4a6R251

PR Checklist

• [x] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• [x] You have signed the CLA.
• [x] All existing tests are passing: https://github.com/NativeScript/ios-runtime/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• [ ] Tests for the changes are included.

What is the current behavior?

refs https://github.com/NativeScript/ns-v8ios-runtime/issues/25