Remove empty functions from QLocale test.

These functions have been commented-out and empty for more than five
years.

Change-Id: I52d6dc0366cd8eae8701b05e4c66e9911bf7e8f7
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

tests/auto/corelib/tools/qlocale/tst_qlocale.cpp

@@ -691,16 +691,6 @@ void tst_QLocale::long_long_conversion_extra()
     QCOMPARE(l.toString((qulonglong)12345), QString("12,345"));
 }
 
-/*
-void tst_QLocale::languageToString()
-{
-}
-
-void tst_QLocale::setDefault()
-{
-}
-*/
-
 void tst_QLocale::testInfAndNan()
 {
     double neginf = log(0.0);