rt/tst-aio7 weirdness on ppc

[Roland McGrath]

>    Is this problem really supposed to be fixed in glibc cvs?

With this change, I believe it's fixed.  I have not seen a problem since.

2002-09-30  Roland McGrath  <roland@redhat.com>

	* rt/tst-aio7.c (do_test): Don't read from stdin, which could be the
	terminal when the test is running in a background job.  Instead, make
	a pipe and read from its read half while never writing anything to it.