Android: Fix QCollator test

On Android the POSIX implementation of QCollator is used, and
this does not support setting other locales than the default.

Change-Id: I25d23949341fc555e8be4f6836ae68cc8813cc46
Reviewed-by: BogDan Vatra <bogdan@kde.org>

tests/auto/corelib/tools/qcollator/tst_qcollator.cpp

@@ -170,6 +170,11 @@ void tst_QCollator::compare()
 
     QCollator collator(locale);
 
+#if defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_NO_SDK)
+    if (collator.locale() != QLocale())
+        QSKIP("Posix implementation of collation only supports default locale");
+#endif
+
     if (numericMode)
         collator.setNumericMode(true);