Fixed incremental test execution.

The Unity test execution task did not depend upon the test input
files so it would not execute unless the output log file did not
exist.  This change will execute Unity tests when the input files
are newer than the output log file.

Bug: 132354085
Change-Id: Ib3e2cf0809ee872f246b5bf176b8e2ea5a57c5e5

Author: Stewart Miles

build.gradle

@@ -807,6 +807,7 @@ Task createUnityTask(String taskName, String summary,
                                   summary, projectName),
                                 type: Exec,
                                 dependsOn: dependsOn).with {
+    inputs.files fileTree(projectDir)
     outputs.files files(logFile)
     executable project.ext.unityExe
     args executeArguments