fix getsubopt declaration

[Eric Blake]

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Any objections to this?  POSIX 2008 requires getsubopt in <stdlib.h> (even
though it also requires getopt in <unistd.h> - what a historical wart).

2009-12-22  Eric Blake  <ebb9@byu.net>

	* libc/include/sys/unistd.h (suboptarg, getsubopt): Move...
	* libc/include/stdlib.h: ...here, to match POSIX for getsubopt.

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

Eric Blake             ebb9@byu.net
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