qbs build: Add the possibility to include additional autotests.

For plugins that don't live in the main repo.

Change-Id: Iebe4b05bfb60f86531ec82a4ae555fdfaac39ead
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

qtcreator.qbs

@@ -17,6 +17,7 @@ Project {
     property pathList additionalPlugins: []
     property pathList additionalLibs: []
     property pathList additionalTools: []
+    property pathList additionalAutotests: []
     property string libDirName: "lib"
     property string ide_library_path: {
         if (qbs.targetOS.contains("osx"))

tests/auto/auto.qbs

@@ -22,5 +22,5 @@ Project {
         "treeviewfind/treeviewfind.qbs",
         "utils/utils.qbs",
         "valgrind/valgrind.qbs"
-    ]
+    ].concat(project.additionalAutotests)
 }