sdlwiki: SDL_version.h moved to include/SDL3

.wikiheaders-options

@@ -4,7 +4,7 @@ incsubdir = include
 wikisubdir =
 apiprefixregex = (SDL_|SDLK_|KMOD_|AUDIO_)
 mainincludefname = SDL.h
-versionfname = include/SDL_version.h
+versionfname = include/SDL3/SDL_version.h
 versionmajorregex = \A\#define\s+SDL_MAJOR_VERSION\s+(\d+)\Z
 versionminorregex = \A\#define\s+SDL_MINOR_VERSION\s+(\d+)\Z
 versionpatchregex = \A\#define\s+SDL_PATCHLEVEL\s+(\d+)\Z