Use _tWinMain instead of WinMain, as welcome.exe uses TCHAR in other places

svn path=/trunk/; revision=33376

reactos/base/setup/welcome/welcome.c

@@ -96,9 +96,9 @@ MainWndProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
 /* FUNCTIONS ****************************************************************/
 
 int WINAPI
-WinMain(HINSTANCE hInst,
+_tWinMain(HINSTANCE hInst,
 	HINSTANCE hPrevInstance,
-	LPSTR lpszCmdLine,
+	LPTSTR lpszCmdLine,
 	int nCmdShow)
 {
   WNDCLASSEX wndclass;