QaxServerMain WinMain memory leak

The QVector<T>::append(T&&) method introduced in https://codereview.qt-project.org/#/c/121810/ leaks memory when T=char*.

The reason for the leak seem to be that the placement new neither takes over ownership, nor deletes the input rvalue reference.

How to reproduce (in Visual Studio 2012):

• Build & run the attached reproducer.
• Observe a leak(s) listed in the Visual studio "Output" windows on program termination.
• Restart application.
• Break the program early and assign " {, , msvcr110d.dll}

  _crtBreakAlloc" to the leaked allocation number in the debugger (more info in https://msdn.microsoft.com/en-us/library/x98tx3cf.aspx).

• Observer that debugger breaks in _strdup call entered as argument to QVector<char*>::append(T&&).

Leaking call stack (from command-line argument handing at startup):

• msvcr110d.dll!_strdup(const char * string=0x0054b980) Line 48 C
• Qt5Cored.dll!qWinMain(HINSTANCE__ * instance=0x01380000, HINSTANCE__ * prevInstance=0x00000000, char * cmdParam=0x00544668, int cmdShow=10, int & argc=1, QVector<char *> & argv= {...}

  ) Line 157 C++

• QtPluginHost.exe!WinMain(HINSTANCE__ * hInstance=0x01380000, HINSTANCE__ * hPrevInstance=0x00000000, char * __formal=0x004f6b0e, int nShowCmd=10) Line 248 C++
• QtPluginHost.exe!__tmainCRTStartup() Line 528 C
• QtPluginHost.exe!WinMainCRTStartup() Line 377 C