genffi: %platform expressions.
genffi: %platform expressions.

Take a '-plat' argument.
Adds the following s-expression 'special form':

  (some thing (%platform Linux 19 Darwin 27 else 34))

to the spec syntax.

also: sanitize non-function sigs.

samrushing/irken-compiler,samrushing/irken-compiler,samrushing/irken-compiler,samrushing/irken-compiler