Add PHP-version-specific traits to extend the upgrader skin feedback method #5283
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WordPress trunk is doing refactorings to use more PHP 5.6+ features since the minimum PHP version was raised.
As long as we stick to PHP 5.4, we need to provide compatibility mechanisms to deal with this.
This PR adds a
Compat
namespace to systematically provide compatibility code that can be easily retraced and removed later again.This should solve the build failure found at https://travis-ci.org/wp-cli/wp-cli/jobs/586215547#L736
Related #5282