Be explicit about alowing empty globs (second part)

There are several globs that are empty and this prevents building
with the incompatible flag #8195.
This commit just makes it explicit that empty is allowed.

third_party/googleapis/BUILD.bazel

@@ -24,7 +24,7 @@ exports_files(["LICENSE"])
 
 filegroup(
  name = "srcs",
- srcs = glob(["**"]),
+ srcs = glob(["**"], allow_empty = True),
  visibility = ["@io_bazel//third_party:__pkg__"],
 )