tst_QLocale: clean out the last use of foreach

Change-Id: I0a4810dbae2137764ea1d14d515e9f06f7f2129d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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

@@ -201,7 +201,8 @@ void tst_QLocale::initTestCase()
 
     // Get an environment free of any locale-related variables
     cleanEnv.clear();
-    foreach (QString const& entry, QProcess::systemEnvironment()) {
+    const QStringList sysenv = QProcess::systemEnvironment();
+    for (const QString &entry : sysenv) {
         if (entry.startsWith("LANG=") || entry.startsWith("LC_") || entry.startsWith("LANGUAGE="))
             continue;
         cleanEnv << entry;