Prepare for Bazel incompatible changes
Fixes googletest for upcoming --incompatible_load_cc_rules_from_bzl (https://github.com/bazelbuild/bazel/issues/8743) and --incompatible_load_python_rules_from_bzl (https://github.com/bazelbuild/bazel/issues/9006).
This change was automatically generated with buildifier -lint=fix -warnings=all $(find . -name "BUILD" -o -name "BUILD.bazel" -o -name "*.bzl").