Utils: Make Environment::setEnglishOutput a proper member function

The previous indirection was useful as long as they were overloads
for QProcessEnvironment and QStringList, but these are gone now.

Change-Id: I5066bd2e72fd06948a5cc7bbac6dda9006db96ed
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -4976,7 +4976,7 @@ CoreInfo CoreInfo::readExecutableNameFromCore(const Runnable &debugger, const QS
 
     SynchronousProcess proc;
     Environment envLang(QProcess::systemEnvironment());
-    Environment::setupEnglishOutput(&envLang);
+    envLang.setupEnglishOutput();
     proc.setEnvironment(envLang);
     proc.setCommand({debugger.executable, args});
     proc.runBlocking();