Haiku: Adapt tst_qdir unit test to Haiku

Use an existing, non-symlinked directory for the unit test.

Change-Id: Ice9976a4fd10c42c3cb014614ccd699bcea1065f
Reviewed-by: Augustin Cavalier <waddlesplash@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/corelib/io/qdir/tst_qdir.cpp

@@ -2057,6 +2057,8 @@ void tst_QDir::equalityOperator_data()
     QString pathinroot("c:/windows/..");
 #elif defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_NO_SDK)
     QString pathinroot("/system/..");
+#elif defined(Q_OS_HAIKU)
+    QString pathinroot("/boot/..");
 #else
     QString pathinroot("/usr/..");
 #endif