The `//tests:version_test_binary_*` targets fail when run on Bazel 8
with Windows with a "permission denied" error with the Python
executable. The notable thing about these tests is they're shell
tests with a data dependency on the Python program, so a symlink
is created to refer to the Python program. As best I can tell, Bazel 8
isn't creating the symlink quite right, so Windows considers the file
non-executable.

Setting `--windows_enable_symlinks` fixes this, but it isn't clear why.
Presumably it's telling Bazel to create symlinks more properly.