CMake: put a dependent option *after* its dependencies.

Also remove a duplicated option. Ugh this is a mess.

CMakeLists.txt

@@ -63,8 +63,6 @@ endif()
 
 cmake_dependent_option(TARGET_GLES2 "Build for OpenGL ES 2 / WebGL 1.0" ON "TARGET_GLES" OFF)
 cmake_dependent_option(TARGET_DESKTOP_GLES "Build for OpenGL ES on desktop" OFF "TARGET_GLES" OFF)
-cmake_dependent_option(TARGET_HEADLESS "Build command-line utilities for use on a headless machines" OFF "WITH_GL" OFF)
-cmake_dependent_option(TARGET_VK "Build libraries with Vulkan interoperability" ON "WITH_VK" OFF)
 
 # Magnum GL Info (currently only using GLX/CGL/EGL on *nix, WGL/EGL on Windows
 # and EGL on Emscripten)
@@ -110,6 +108,7 @@ cmake_dependent_option(WITH_GL "Build GL library" ON "NOT WITH_SHADERS;NOT WITH_
 option(WITH_PRIMITIVES "Builf Primitives library" ON)
 option(WITH_VK "Build Vk library" OFF)
 
+cmake_dependent_option(TARGET_HEADLESS "Build command-line utilities for use on a headless machines" OFF "WITH_GL" OFF)
 cmake_dependent_option(TARGET_GL "Build libraries with OpenGL interoperability" ON "WITH_GL" OFF)
 cmake_dependent_option(TARGET_VK "Build libraries with Vulkan interoperability" ON "WITH_VK" OFF)