chore: Remove duplication of py_proto_library definition

Author: czgdp1807

struct2tensor/struct2tensor.bzl

@@ -414,15 +414,3 @@ def py_proto_library(name, deps, visibility = None, **kwargs):
         visibility = visibility,
         **kwargs
     )
-
-def py_proto_library(name, deps, visibility = None, **kwargs):
-    """Simple wrapper for py_proto_library using custom rule.
-
-    This macro provides OSS compatibility for py_proto_library targets.
-    """
-    _py_proto_library_rule(
-        name = name,
-        deps = deps,
-        visibility = visibility,
-        **kwargs
-    )