Give priority to GLFW_OPENGL_ES_API over GLFW_OPENGL_API in window_glfw.c

[spedagadi]

Just a suggestion - On ARM boards, the rendering is slow with OpenGL but OpenGL ES is much better and realtime to some extent. In plplay's window_glfw.c, this array

libplacebo/demos/window_glfw.c

Line 199 in 1fd3c7b

} gl_vers[] = {

could be adjusted such that the window creation tries all OpenGL ES options first and then tries OpenGL if unsuccessful.