Add Yoga JNI bindings to libcoldstart

Summary:
Yoga's JNI bindings are usually loaded during class loading, and can stall the UI thread.

Here, we try to mitigate the problem by adding the bindings to libcoldstart.

Reviewed By: michalgr

Differential Revision: D12956818

fbshipit-source-id: 9dda5cb6d26c2bae64606bc2d7c98ab8f7c05a30

tools/build_defs/oss/yoga_defs.bzl

@@ -174,6 +174,8 @@ def yoga_cxx_binary(*args, **kwargs):
 def yoga_cxx_library(*args, **kwargs):
     # Currently unused
     kwargs.pop("platforms", None)
+    kwargs.pop("allow_jni_merging", None)
+
     native.cxx_library(*args, **kwargs)
 
 def yoga_cxx_test(*args, **kwargs):