RFA: .opt files for x86, darwin and lynxos

[Kelley Cook]

 #if TARGET_MACHO
-      darwin_one_byte_bool = "";
+      darwin_one_byte_bool = 1;
 #endif
  


 > A general comment is this vaporizes lots of comments. I'm not sure
 > how I feel about that, but thought I would point that out.

Alternatively to Richard's more correct suggestion, you could also put them 
into the respective .opt file preceding them with a ";".

I took this option when I moved most of the -f options to common.opt.

Kelley Cook