GLFW example

[StarOrpheus]

When providing imgui via vcpkg.json (manifest mode), like this one:

{
  "name": "foobarar",
  "version": "0.3",
  "dependencies": [
    {
      "name": "imgui",
      "features": ["glfw-binding", "opengl3-binding", "freetype"]
    }
  ]
}

Building of glfw opengl3 example fail:
tl;dr undefined reference to OpenGL functions.

If ImGui pushes its loader, including glfw without #define GLFW_INCLUDE_NONE is kinda sus.

#include <imgui_impl_opengl3_loader.h>

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

Fixes this issue.
Is there an issue I can upvote or should I create a new one?