Using cc_import + interface_library/shared_library to link libcef.lib causes
libcef.dll to be copied as a transitive dependency, leading to issues with
complex Bazel configs. Instead, we explicitly link libcef.lib in the binary
target (cc_binary + linkopts/additional_linker_inputs) and explicitly copy
libcef.dll to the target directory.
Unqualified target labels don't resolve correctly when the
disribution is loaded as an external repo. Mapping, if necessary,
can be performed using the `repo_mapping` parameter to
http_archive() or local_repository().
Add support for building the CEF binary distribution using Bazel
and the default platform toolchain. Tested to work for Windows
x64, MacOS ARM64 and x64 (cross-compile from ARM64), and
Linux x64. Windows x86 (cross-compile from x64) is known to
be broken, see https://github.com/bazelbuild/bazel/issues/22164.
Includes minor changes to tests directory structure to meet
Bazel build requirements.