BuildManager: Provide context of earlier build steps to init

This information can be used to get information from earlier steps,
which e.g. queried for android devices to deploy to.

Change-Id: Iefe1c9443915cb6211f86f98ff7aaf3cb75145ba
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/ios/iosdsymbuildstep.h

@@ -47,7 +47,7 @@ class IosPresetBuildStep : public ProjectExplorer::AbstractProcessStep
     friend class IosPresetBuildStepFactory;
 
 public:
-    bool init() override;
+    bool init(QList<const BuildStep *> &earlierSteps) override;
     void run(QFutureInterface<bool> &fi) override;
 
     ProjectExplorer::BuildStepConfigWidget *createConfigWidget() override;