Fix support for default python version when using pycross_register_for_python_toolchains #57
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When registering toolchains and environments using
pycross_register_for_python_toolchains
, the entries corresponding to the default Python version should not have a@rules_python//python/config_settings:python_version
flag setting. This mirrors how rules_python's own toolchains are constructed.Also, this PR adds a
config_setting
attribute topycross_target_environment
. If set, the generated lock file won't have aconfig_setting
for that environment, andselect
statements will use the provided label.