Missing list of feature dependencies in warning for Module::Build features.

[schwern]

tl;dr... we need a way to get at the values of %$auto_features from Module::Build::ConfigData.

_warn_mb_feature_deps is for warning about missing Module::Build features, as opposed to features of the current distribution. For example, without Software::License MB can't generate a LICENSE file. Here's an example from perl5i.

$ PERL5OPT=-MDevel::Hide=Software::License ./Build distmeta
Devel::Hide hides Software/License.pm
Devel::Hide hides Software/License.pm
Devel::Hide hides Software/License.pm
Devel::Hide hides Software/License.pm
Creating README using Pod::Text
Creating LICENSE file
The 'license_creation' feature is not available.  Please install missing

feature dependencies and try again.

Aborting.

There's supposed to be an additional message there, generated by _feature_deps_msg, which tells the user what modules to install. Its missing.

_warn_mb_feature_deps incorrectly uses _feature_deps_msg which references the distribution's features (in this example its perl5i) not Module::Build's. Unfortunately I see no way to get the list of auto features out of Module::Build::ConfigData.

[KES777]

I found this for workaround

In certain circumstances, you may need to install some packages to get this to run properly. If you see the following error, you should install Software::License:
The 'license_creation' feature is not available. Please install missing feature dependencies and try again.