Module::Build with L

When you use -L option, the first thing cpanm tries to install might be always Module::Build and its dependencies, even if you don't ask for it. This is to make sure you have the loadable Module::Build in your new library path, instead of loading it from the core library path. This is kind of annoying but it's the only way to get the dependencies right and avoid runtime build errors of Module::Build.

This problem should be addressed when Module::Build 0.38 and its all dependencies go to core library path in perl 5.14.