[MNG-6642] Revert "[MNG-5995] Remove dependency to maven-compat (#185)"

This partially reverts commit bb3ec5d to restore working with Tycho P2 repository.

Author: slachiewicz

maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuildingHelper.java

@@ -33,7 +33,6 @@
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.InvalidRepositoryException;
 import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.bridge.MavenRepositorySystem;
 import org.apache.maven.classrealm.ClassRealmManager;
 import org.apache.maven.model.Build;
 import org.apache.maven.model.Extension;
@@ -45,6 +44,7 @@
 import org.apache.maven.plugin.PluginManagerException;
 import org.apache.maven.plugin.PluginResolutionException;
 import org.apache.maven.plugin.version.PluginVersionResolutionException;
+import org.apache.maven.repository.RepositorySystem;
 import org.codehaus.plexus.PlexusContainer;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.codehaus.plexus.component.annotations.Component;
@@ -78,7 +78,7 @@ public class DefaultProjectBuildingHelper
     private ProjectRealmCache projectRealmCache;
 
     @Requirement
-    private MavenRepositorySystem repositorySystem;
+    private RepositorySystem repositorySystem;
 
     @Requirement
     private MavenPluginManager pluginManager;
@@ -92,7 +92,7 @@ public List<ArtifactRepository> createArtifactRepositories( List<Repository> pom
 
         for ( Repository repository : pomRepositories )
         {
-            internalRepositories.add( MavenRepositorySystem.buildArtifactRepository( repository ) );
+            internalRepositories.add( repositorySystem.buildArtifactRepository( repository ) );
         }
 
         repositorySystem.injectMirror( request.getRepositorySession(), internalRepositories );