local.h in scanf.c

[Doug Evans]

J. Johnston writes:
 > local.h is just a local header file that is not externalized.  It is also not 
 > meant to be included multiple times.  The C header files available to the 
 > end-user have to be protected from multiple inclusion as some header files 
 > include others and the end-user is not restricted from including them multiple 
 > times.  This is not the case for local.h.

That doesn't mean that one can't still protect local.h from multiple inclusion.
Whether it is internal or external is irrelevant to the discussion.