improve WGPU / GLFW / Wayland story by weak linking and adjusting docs

vendor/wgpu/glfwglue/glue_linux.odin

@@ -3,11 +3,8 @@ package wgpu_glfw_glue
 import "vendor:glfw"
 import "vendor:wgpu"
 
-// GLFW needs to be compiled with wayland support for this to work.
-SUPPORT_WAYLAND :: #config(WGPU_GFLW_GLUE_SUPPORT_WAYLAND, false)
-
 GetSurface :: proc(instance: wgpu.Instance, window: glfw.WindowHandle) -> wgpu.Surface {
-	when SUPPORT_WAYLAND {
+	if glfw.GetPlatform != nil {
 		if glfw.GetPlatform() == glfw.PLATFORM_WAYLAND {
 			display := glfw.GetWaylandDisplay()
 			surface := glfw.GetWaylandWindow(window)
@@ -24,6 +21,10 @@ GetSurface :: proc(instance: wgpu.Instance, window: glfw.WindowHandle) -> wgpu.S
 				},
 			)
 		}
+
+		if glfw.GetPlatform() != glfw.PLATFORM_X11 {
+			panic("wgpu glfw glue: unsupported platform, expected Wayland or X11")
+		}
 	}
 
 	display := glfw.GetX11Display()