Remove implicit_outputs from apple_binary (#1898)

This is never used by the rules or anything requesting it. I don't think
the compatibility mentioned here really matters anymore.

apple/apple_binary.bzl

@@ -183,8 +183,4 @@ rule is being provided for the purpose of transitioning users from the built-in
 implementation of `apple_binary` in Bazel core so that it can be removed.
 """,
  implementation = _apple_binary_impl,
- implicit_outputs = {
- # Provided for compatibility with built-in `apple_binary` only.
- "lipobin": "%{name}_lipobin",
- },
 )

apple/internal/rule_factory.bzl

@@ -1156,7 +1156,6 @@ def _create_apple_binary_rule(
  doc,
  additional_attrs = {},
  cfg = transition_support.apple_rule_transition,
- implicit_outputs = None,
  platform_type = None,
  product_type = None,
  require_linking_attrs = True):
@@ -1254,7 +1253,6 @@ binaries/libraries will be created combining all architectures specified by
  doc = doc,
  executable = is_executable,
  fragments = ["apple", "cpp", "objc"],
- outputs = implicit_outputs,
  toolchains = use_cpp_toolchain(),
  )