staging: lustre: libcfs: discard MAX_NUMERIC_VALUE

This is unused.
drivers/staging/lustre/lnet/lnet/nidstrings.c does use the name,
but it includes its own local definition.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>