[PATCH] Remove obsolete reference to <sys/_posix.h>

[Garrett Wollman]

<<On Tue, 13 Jul 2004 16:03:28 +0300, Panagiotis Astithas <past at ebs.gr> said:

> while doing some porting work I found that in src/sys/posix4/mqueue.h we 
> still include sys/_posix.h, despite having removed the relevant file in 
> 2002. This tiny patch should fix this:

Not really.  A better patch would apparently be to remove the file,
since the function is not implemented; if it were implemented, more
changes to the header than this would be required.

-GAWollman