Alter ctype-checked to handle EOF and be hand-written.

Alter ctype-checked to handle EOF and be hand-written.
Along the way, replace the code generation with code that punts the work
onto the stdlib's C functions, needing only a single `identity' array
for all the macros.  A mkdir needed to be added in Makefile.am because
otherwise etc didn't exist in a distcheck and attempting to redirect
stdout to a file in etc failed.  I'm not happy that's the best automake
way to achieve this, i.e. what if another rule attempts to create in etc
first?