qbs project files: Fix some dependency exports.

Change-Id: I7049fcaab77639c17c4d0e74f7d9360a80fafcaa
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/libs/extensionsystem/extensionsystem.qbs

@@ -46,4 +46,8 @@ QtcLibrary {
         "images/notloaded.png",
         "images/ok.png",
     ]
+
+    Export {
+        Depends { name: "Qt.core" }
+    }
 }

src/libs/utils/utils.qbs

@@ -217,7 +217,6 @@ QtcLibrary {
     }
 
     Export {
-        cpp.includePaths: [ ".." ]
         Depends { name: "Qt"; submodules: ["concurrent", "widgets" ] }
     }
 }

src/plugins/cpptools/cpptools.qbs

@@ -131,5 +131,6 @@ QtcPlugin {
 
     Export {
         Depends { name: "CPlusPlus" }
+        Depends { name: "Qt.concurrent" }
     }
 }