https://gitlab.synchro.net/main/sbbs/-/commit/ba3763054755063afed4b714
Modified Files:
	src/build/Common.gmake src/conio/sdl_con.c
Log Message:
Some more macOS fixes...
1) Use static SDL since it's required by both conio and XPDev
2) Since the SDL thread will always run, any attempt to shut down
   the SDL thread calls exit(0).  Not exactly what we want to
   return, but at least this makes it not hang waiting for the
   impossible.
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