Summary:
This should fix build failures with prod config. The symbols should only be in internal builds and not the prod ones.
```
stderr: Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_SKNamed", referenced from:
...
"_OBJC_CLASS_$_SKComponentLayoutDescriptor", referenced from:
...
```
Reviewed By: rzito
Differential Revision: D24250749
fbshipit-source-id: 68c3d066a76baf4b1646f27dac0fd081bcaff41b
f1baf3c1d8