Without the explicit Foundation dep, linker fails with this message:
```
= note: ld: framework not found Foundation
clang-7: error: linker command failed with exit code 1 (use -v to see invocation)
error: aborting due to previous error
error: could not compile `i18n-embed-fl`
```
Co-authored-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>