Revert "[573659] Delegate unit resolution to QVTo projects only"

This reverts commit 117767930c9795b115c743d398a795890f6fe954.
diff --git a/plugins/org.eclipse.m2m.qvt.oml.project/src/org/eclipse/m2m/internal/qvt/oml/project/builder/WorkspaceUnitResolver.java b/plugins/org.eclipse.m2m.qvt.oml.project/src/org/eclipse/m2m/internal/qvt/oml/project/builder/WorkspaceUnitResolver.java
index 0100817..8c8585d 100644
--- a/plugins/org.eclipse.m2m.qvt.oml.project/src/org/eclipse/m2m/internal/qvt/oml/project/builder/WorkspaceUnitResolver.java
+++ b/plugins/org.eclipse.m2m.qvt.oml.project/src/org/eclipse/m2m/internal/qvt/oml/project/builder/WorkspaceUnitResolver.java
@@ -44,7 +44,6 @@
 import org.eclipse.m2m.internal.qvt.oml.compiler.UnitResolver;
 import org.eclipse.m2m.internal.qvt.oml.emf.util.URIUtils;
 import org.eclipse.m2m.internal.qvt.oml.project.QVTOProjectPlugin;
-import org.eclipse.m2m.internal.qvt.oml.project.QvtProjectUtil;
 import org.eclipse.m2m.internal.qvt.oml.runtime.project.DeployedImportResolver;
 import org.eclipse.m2m.internal.qvt.oml.runtime.project.ProjectDependencyTracker;
 
@@ -102,10 +101,6 @@
 			resolvers = new ArrayList<UnitResolver>(referencedProjects.size());
 
 			for (IProject referenced : referencedProjects) {
-				if (!QvtProjectUtil.isQvtProject(referenced)) {
-					continue;
-				}
-				
 				if (analyzedProjects.containsKey(referenced)) {
 					resolvers.add(analyzedProjects.get(referenced));
 					continue;