Add SDL3 to examples/all/all_vendor.odin

examples/all/all_vendor.odin

@@ -19,6 +19,8 @@ import IMG        "vendor:sdl2/image"
 import MIX        "vendor:sdl2/mixer"
 import TTF        "vendor:sdl2/ttf"
 
+import SDL3       "vendor:sdl3"
+
 import vk         "vendor:vulkan"
 
 // NOTE(bill): only one can be checked at a time
@@ -44,6 +46,7 @@ _ :: rl
 _ :: zlib
 
 _ :: SDL
+_ :: SDL3
 _ :: SDLNet
 _ :: IMG
 _ :: MIX