avoid compiler warning in getopt.h

[Eric Blake]

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According to Eric Blake on 9/26/2009 11:46 AM:
> OK to apply, to avoid warnings about declaring the unused type getopt_data
> inside a function argument list?
> 
> 2009-09-26  Eric Blake  <ebb9@byu.net>
> 
> 	* libc/include/getopt.h (__getopt_r, __getopt_long_r)
> 	(__getopt_long_only_r): Protect declarations, to avoid compiler
> 	warning.

Ping.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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