Update SDL dependent code and makefile segments to prepare for SDL3 #497
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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 expectation is that when SDL 3 is released and has become widely available the processor conditionals could be removed.The SDL3 implementation is currently available as a preview release, 3.1.0, at
SDL3 prerelease 3.1.0