Utils::Environment: Use systemEnvironment from QProcessEnvironment

The QProcessEnvironment::systemEnvironment() uses the function
GetEnvironmentStringsW(), which allows for retrieving values that can
not be encoded in the current locale.

Also see QTCREATORBUG-8184 for a related bug.

Change-Id: Id7c9b8c881db7ba2efd13f2fb241fbbdb9d2a7eb
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/libs/utils/environment.cpp

@@ -33,6 +33,7 @@
 
 #include <QDir>
 #include <QProcess>
+#include <QProcessEnvironment>
 #include <QString>
 #include <QCoreApplication>
 
@@ -40,7 +41,7 @@ class SystemEnvironment : public Utils::Environment
 {
 public:
     SystemEnvironment()
-        : Environment(QProcess::systemEnvironment())
+        : Environment(QProcessEnvironment::systemEnvironment().toStringList())
     {
         if (Utils::HostOsInfo::isLinuxHost()) {
             QString ldLibraryPath = value(QLatin1String("LD_LIBRARY_PATH"));