libnsm.a: Replace __attribute_noinline__

Replace the __attribute_noinline__ form with

  __attribute__((__noinline__)).

Even though the compiler didn't complain about __attribute_malloc__,
also replace those in order to maintain consistent style throughout the
source file.

Fix for:

  https://bugzilla.linux-nfs.org/show_bug.cgi?id=194

Reported-by: "Gabor Z. Papp" <gzp@papp.hu>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>