fix #100. include X11/extensions/Xrandr.h
fix #100. include X11/extensions/Xrandr.h

go-gl/glfw,jonbuckley33/glfw3,james4k/glfw,go-gl/glfw,go-gl/glfw,jonbuckley33/glfw3,gonutz/glfw,james4k/glfw,gonutz/glfw