Remove erroneous statement for 1988/dale in thanks

Particularly about some C pre-processors being able to parse some
constructs. If they can I didn't see it now even if I did in the past
(which I'm no longer sure of). In any case the little bit of information
doesn't matter; there are far more interesting things there and probably
far more things than are interesting as well.

thanks-for-fixes.md

@@ -556,9 +556,6 @@ for/*/(;;);/*/k()){O/*/*/c);
 cannot form `fork())` in modern C compilers. Since it was not done through a
 macro it was simply changed to be `fork()`, rather than adding a new macro.
 
-(What is quite fun is that at least some C pre-processors can form these
-constructs! Can you figure out why this is?)
-
 The other problem that could not be resolved by the `-traditional-cpp` was that
 modern compilers do not allow directives like: