bug#25283: grep: (standard input): invalid argument when run from make

[Paul Eggert]

Mike Frysinger wrote:

this fails:
        (make -v | grep .) >/dev/null 2>&1
but this works:
        (make -v | grep .) >/dev/null 2>/dev/null

That's the same issue, because GNU 'make' sets stderr's O_APPEND flag too, so in 
the former case grep's stdout is in append mode whereas in the latter case it's not.