Launch games under the correct user account on Windows (#600)

src/platform/common.h

@@ -17,6 +17,20 @@
 struct sockaddr;
 struct AVFrame;
 
+// Forward declarations of boost classes to avoid having to include boost headers
+// here, which results in issues with Windows.h and WinSock2.h include order.
+namespace boost {
+namespace filesystem {
+class path;
+}
+namespace process {
+class child;
+template<typename Char>
+class basic_environment;
+typedef basic_environment<char> environment;
+} // namespace process
+} // namespace boost
+
 namespace platf {
 constexpr auto MAX_GAMEPADS = 32;
 
@@ -289,6 +303,8 @@ std::shared_ptr<display_t> display(mem_type_e hwdevice_type, const std::string &
 // A list of names of displays accepted as display_name with the mem_type_e
 std::vector<std::string> display_names(mem_type_e hwdevice_type);
 
+boost::process::child run_unprivileged(const std::string &cmd, boost::filesystem::path &working_dir, boost::process::environment &env, FILE *file, std::error_code &ec);
+
 input_t input();
 void move_mouse(input_t &input, int deltaX, int deltaY);
 void abs_mouse(input_t &input, const touch_port_t &touch_port, float x, float y);