Fixed stage skipping in travis

travis/build-helper.sh

@@ -36,8 +36,8 @@ run() {
     touch skip.txt
     ;;
 
-  Build2 | Build3 | Build4)
-    # Make (run 2-4)
+  Build2 | Build3)
+    # Make (run 2-3)
     travis_fold start make
     cd build
     make -j$N_JOBS
@@ -45,6 +45,14 @@ run() {
     touch skip.txt
     ;;
 
+  Build4)
+    # Make (run 2-4)
+    travis_fold start make
+    cd build
+    make -j$N_JOBS
+    travis_fold end make
+    ;;
+
   TestAll)
     # Test all
     travis_fold start test_all