In Gradle 3.3, when an API that will be removed in 4.0 is called, a
deprecation warning is output as part of the build. Users have noticed
his warning and, quite reasonably, complained about it. Unfortunately,
avoiding the warning requires the use of an API that was introduced in
Gradle 3.x which we can't use directly as we want to remain compatible
with Gradle 2.x.

This commit introduces the use of reflection to call
ProjectDependency.getTargetConfiguration() via reflection when it's
available (Gradle 3) and ProjectDependency.getProjectConfiguration()
when it's not (Gradle 2).

Closes gh-8154