local.h in scanf.c

[Artem B. Bityuckiy]

Hello.

We do some development with Newlib and have changed local.h. This caused 
error while compiling scanf.c. See at newlib/libc/stdio/scanf.c - 
local.h is included twice. Is this just non-essential defect? Why 
local.h doesn't contain something like #ifdef _LOCAL_H_/#endif ?
If this is a defect I offer to:
1. exclude double local.h inclusion from scan.f
2. add #ifdef _LOCAL_H_/#endif to newlib/libc/stdio/local.h

Artem B. Bityuckiy.