match pty.h to glibc

[Eric Blake]

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As of glibc 2.8, pty.h now marks the last two arguments of openpty and
forkpty as const.  These functions are not standardized, and we aren't
altering the parameters, so I see no reason why we can't also make the
change.  OK to apply?

2009-12-26  Eric Blake  <ebb9@byu.net>

	* include/pty.h (openpty, forkpty): Mark last two arguments const,
	to match glibc 2.8.
	* libc/bsdlib.cc (openpty, forkpty): Likewise.

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

Eric Blake             ebb9@byu.net
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