[PATCH]: export getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked

[Nicholas Wourms]

[stdio with explicit client locking]

These are useful for programs which desire the non-threadsafe 
implementation of the respective functions minus the unlocked suffix.  
These functions are defined under the SUSv2:

http://www.opennc.org/onlinepubs/7908799/xsh/getc_unlocked.html

Since May, newlib has offered these functions for use.  They always get 
picked up by the more recent alphas of diffutils (which I am recompiling 
for the nth time).  Well since they are part of the official spec I 
figured why not export them so they can be of some use?  Attached is a 
diff which exports these newlib symbols & updates the docs to reflect this.
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