VCS[Mercurial]: Remove LANG=C setting

as it breaks the log output.
Task-number: QTCREATORBUG-1623

src/plugins/mercurial/mercurialclient.cpp

@@ -121,8 +121,6 @@ bool MercurialClient::executeHgSynchronously(const QString  &workingDir,
     QProcess hgProcess;
     if (!workingDir.isEmpty())
         hgProcess.setWorkingDirectory(workingDir);
-    MercurialJobRunner::setProcessEnvironment(hgProcess);
-
     const MercurialSettings &settings = MercurialPlugin::instance()->settings();
     const QString binary = settings.binary();
     const QStringList arguments = settings.standardArguments() + args;

src/plugins/mercurial/mercurialjobrunner.cpp

@@ -162,16 +162,6 @@ QString MercurialJobRunner::msgTimeout(int timeoutSeconds)
     return tr("Timed out after %1s waiting for mercurial process to finish.").arg(timeoutSeconds);
 }
 
-// Set environment for a hg process to run in locale "C". Note that there appears
-// to be a bug in hg that causes special characters to be garbled when running
-// in a different language, which seems to be independent from the encoding.
-void MercurialJobRunner::setProcessEnvironment(QProcess &p)
-{
-    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
-    env.insert(QLatin1String("LANG"), QString(QLatin1Char('C')));
-    p.setProcessEnvironment(env);
-}
-
 void MercurialJobRunner::task(const QSharedPointer<HgTask> &job)
 {
     HgTask *taskData = job.data();
@@ -203,9 +193,6 @@ void MercurialJobRunner::task(const QSharedPointer<HgTask> &job)
         qDebug() << Q_FUNC_INFO << "Repository root is " << taskData->repositoryRoot();
 
     QProcess hgProcess;
-    hgProcess.setWorkingDirectory(taskData->repositoryRoot());
-    MercurialJobRunner::setProcessEnvironment(hgProcess);
-
     hgProcess.start(binary, args);
 
     if (!hgProcess.waitForStarted()) {

src/plugins/mercurial/mercurialjobrunner.h

@@ -99,9 +99,6 @@ public:
     static QString msgStartFailed(const QString &binary, const QString &why);
     static QString msgTimeout(int timeoutSeconds);
 
-    // Set environment for a hg process to run in locale "C"
-    static void setProcessEnvironment(QProcess &p);
-
 protected:
     void run();