* Update SDL dependent code and makefile segments to prepare for SDL3
Many APIs have changed between SDL2 and SDL3. This update adds
preprocessor conditionals to adapt the Maiko SDL code to allow selection of
the SDL major version (2 or 3) from the -DSDL=n define.
The SDL3 implementation is currently available as a preview release, 3.1.0, at
https://github.com/libsdl-org/SDL/releases/tag/prerelease-3.1.0
* Add updates for makefile-haiku.x86_64-sdl to prepare for SDL3
* Allow makeright to accept sdl3 as display type to ease SDL3 experiments
* Update CMakeLists.txt for SDL3 library
* Replaces configuration option -DMAIKO_DISPLAY_SDL=ON/OFF with
-DMAIKO_DISPLAY_SDL=OFF/2/3
* Replaces PUBLIC definitions with PRIVATE definitions on targets since
we are not exporting definitions outside this local compilation
* Update messages to indicate which version of SDL is being configured
* Add fixup for SDL3.xcframework on macOS to compensate for missing
RPATH specification (CMake issue 25998)
Compiling with -DMAIKO_ENABLE_NETHUB makes it possible to test out having a WebSocket
server that could pass packets back and forth to the Dodo NetHub.
Setting Emscripten link-time option for EXIT_RUNTIME allows the runtime code to shutdown
when you exit Medley via a (LOGOUT)
Set up preloads for all the parts of the Medley directory that MEDLEYDIR-INIT expects
to be there. The resulting ldesdl.data is (at this time) 128 MB. It can be installed
gzipped if using nginx or some other web server that supports pre-zipped static files.
It would be better to have these as lazy-loading files, but the setup for that is
complicated. Another alternative to embedding all the data would be if a WebSocket
to XNS/Nethub gateway were written and deployed.
Moves the full.sysout from the root of tle system to /medley/loadups/full.sysout,
adds /medley/lispusers/BACKGROUND-YIELD.LCOM and an Emscripten/WAsm specific
site init file at /usr/local/lde/site-init.lisp
Adjusts options so that the options are in the correct place for the
compiler and loader.
