properly add testsuites submodule

Change-Id: Iea043221b965bbbc05f9c98b8f58aa7870acadfe
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@theqtcompany.com>

.gitmodules

-[submodule "tests/auto/TESTSUITES"]
-	path = tests/auto/TESTSUITES
+[submodule "testsuites"]
+	path = tests/auto/3rdparty/testsuites
 	url = ../qtxmlpatterns-testsuites.git

testsuites @ ddfcd98e

+Subproject commit ddfcd98e8d3f78d696bb25ddcaacc3e3cba51e7f

tests/auto/xmlpatternsxqts/tst_xmlpatternsxqts.cpp

@@ -59,7 +59,7 @@ void tst_XmlPatternsXQTS::catalogPath(QString &write) const
     if(dontRun())
         QSKIP("This test takes too long time to run on the majority of platforms.");
 
-    write = QFINDTESTDATA("../TESTSUITES/XQTS/XQTSCatalog.xml");
+    write = QFINDTESTDATA("../3rdparty/testsuites/XQTS/XQTSCatalog.xml");
     return;
 }