8 bit os_f handles

[Jonathan Coxhead]

   Tom wrote,

 | Surely the
 | point here though is that any code using os_f will have to include
 | os.h either directly or indirectly, and the Makefile would normally
 | have a dependency on that for any source file using os_f.

   Not if it's in a 3rd-party library. Or if you just decide, for 
reasons of your own, that you want to relink, but not recompile.

   And in any case, if the compatibility-breakers got their way, 
there might be no changes in "os.h", so even if you did a make, it 
wouldn't show up on the radar.

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