MFC r250553:
	Add the letter 'x' to the font iso05-8x16.fnt

PR:	169797
MFC r250459:
	Add the letter 'q' to the font iso05-8x16.fnt

PR:	72585
PR:	169797
MFC r250412: posix_spawn_file_actions_addopen(3): Correct error for bad file
descriptor.

As per POSIX.1-2008, posix_spawn_file_actions_add* return [EBADF] if a file
descriptor is negative, not [EINVAL]. The bug was only in the manual page;
the code is correct.
MFC 250421: posix_spawn_file_actions_adddup2(3): Document difference with
dup2().

The ability to clear a file descriptor's close-on-exec flag via
posix_spawn_file_actions_adddup2() is in fact proposed in Austin Group issue
#411.