wikiheaders: Defines directly following a non-struct typedef are documented.

The idea is that if you have a `typedef Uint32 MyFlags` that has a bunch of
defines that are meant to be bitflags, you can pack them into the same wiki
page automatically.

This only works with `typedef`s that are _not_ struct/union/enums, and it
only pulls in `#define` lines that immediately follow the typedef line.
Even a blank line or a comment will signal to stop including lines for
this page!

include/SDL3/SDL_keycode.h

@@ -47,13 +47,8 @@
  * \sa SDL_KeyCode
  */
 typedef Sint32 SDL_Keycode;
-
 #define SDLK_SCANCODE_MASK (1<<30)
 #define SDL_SCANCODE_TO_KEYCODE(X)  (X | SDLK_SCANCODE_MASK)
-
-/**
- * A subset of possible virtual key values.
- */
 #define SDLK_UNKNOWN    0
 #define SDLK_RETURN '\r'
 #define SDLK_ESCAPE '\x1B'

include/SDL3/SDL_video.h

@@ -131,7 +131,6 @@ typedef struct SDL_Window SDL_Window;
  * \sa SDL_GetWindowFlags
  */
 typedef Uint32 SDL_WindowFlags;
-
 #define SDL_WINDOW_FULLSCREEN           0x00000001U /**< window is in fullscreen mode */
 #define SDL_WINDOW_OPENGL               0x00000002U /**< window usable with OpenGL context */
 #define SDL_WINDOW_OCCLUDED             0x00000004U /**< window is occluded */