Debug implementation: Don't use format! or String when core is enabled

As --use-core is typically given when the wrapped library is to be used
in a no_std environment, format! and String can not be used.

This is a quick fix that will cause regressions in the quality of the
debug output to users that use core but are not no_std, but enables the
use of bindgen with implemented Debug traits to no_std users.

Closes: https://github.com/rust-lang-nursery/rust-bindgen/issues/1100

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