avoid compiler warning in getopt.h

[Eric Blake]

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

Eric Blake             ebb9@byu.net
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