The teensy test issue 555 sometimes needed a second build

So I added  one if needed

Author: jantje

io.sloeber.tests/src/io/sloeber/core/RegressionTest.java

@@ -118,7 +118,11 @@ public void issue555() {
         try {
             theTestProject.build(IncrementalProjectBuilder.FULL_BUILD, monitor);
             if (Shared.hasBuildErrors(theTestProject)) {
-                fail("Failed to compile the project:" + projectName + " as teensy");
+                Shared.waitForAllJobsToFinish();
+                theTestProject.build(IncrementalProjectBuilder.FULL_BUILD, monitor);
+                if (Shared.hasBuildErrors(theTestProject)) {
+                    fail("Failed to compile the project:" + projectName + " as teensy");
+                }
             }
         } catch (CoreException e) {
             e.printStackTrace();