diff code to enable sdl windows on pure wayland

[limbo127]

without that, mvisor sdl ui always using Xwayland

--- tmp/mvisor/main.cc 2024-10-28 12:01:10.007219778 +0100
+++ main.cc 2024-10-28 11:42:39.140473441 +0100
@@ -222,7 +222,8 @@
}

 const char* displayVar = std::getenv("DISPLAY");

• if (displayVar == nullptr) {

• const char* waylandVar = std::getenv("WAYLAND_DISPLAY");
• if (displayVar == nullptr && waylandVar == nullptr) {
  if (vnc_port == 0) {
  vnc_port = 5901;
  }

[limbo127]

close by pull request submit #64