Validate Xcode build adapter against Wikipedia-iOS build

[lacasseio]

As a user of the Xcode build adapter, I want to build a project with similar complexity as the Wikipedia-iOS build so that I can prove the build adapter works as advertised.

Acceptance Criteria

• When invoking gradle Wikipedia -Dconfiguration=Debug -Dsdk=iphonesimulator, the build completes successfully.

[lacasseio]

The Wikipedia build has the following particularities:

• Presence of empty entries in PBXShellScriptBuildPhase#inputPaths; it's unclear if Xcode considers these empty path in its up-to-date checking.
• Usage of SwiftPM, these seem to be transitive, meaning A -> B -> SwiftPM, project A would have access to SwiftPM products.
• The build doesn't seem to be working locally; we only had some success via the Xcode build adapter

[lacasseio]

According to our experiment, we should be able to propagate the SwiftPM manually from the transitive dependencies to its children.

[lacasseio]

Let me go back on the last comment, it's actually a lack of the implicit dependency service which doesn't look for dependencies into PBXFrameworksBuildPhase's files. Forcing a dependency actually solve the issue. Much easier that propagating the SwiftPM dependencies.