findOpenGL: imported target OpenGL::OpenGL don't work on Windows
Seems it wasn't creating as brief searching the "opengl32" string in FindOpenGL.cmake
file produces only line then the old OPENGL_gl_LIBRARY
variable is set: https://github.com/Kitware/CMake/blob/aa283fdba161eb458b02caaa9f0c32d97c648d6f/Modules/FindOpenGL.cmake#L163
After futher reading I found that this variable sets the old OpenGL::GL
imported target, but it is not reflected in FindOpenGL.cmake documentation.
I think that is better to make a OpenGL::OpenGL
target at WIN32 platform too for consistency with another platforms and document the OpenGL::GL
imported target for WIN32
and old CMake behavior for WIN32
platform (as it defines OpenGL::GL
imported target) so the users could at least mitigate this issue.