`cp -p` incorrectly sets g+s bit when fs supports acl

[Mike Frysinger]

i'm using coreutils-6.10 with acl-2.2.47 on linux-2.6.24.  when using ext2 
with acl support enabled, `cp -p` on a directory who does not have the g+s 
bit set but whose parent does have g+s set, the new destination directory 
will have the g+s bit set.  if the filesystem is remounted with acl support 
turned off, the g+s bit is (correctly) not set on the new destination 
directory.

consider:
dd if=/dev/zero of=fs.img count=512
mke2fs fs.img
mkdir fs
mount -o loop,acl fs.img fs
cd fs
mkdir parent
chmod g+s parent
cd parent
mkdir src
chmod g-s src
cp -pr src dst

now, if i do `ls -l` on the dirs with acl support:
drwxr-sr-x 2 root root 1024 2008-02-22 22:22 dst
drwxr-xr-x 2 root root 1024 2008-02-22 22:22 src

and if i remount w/out acl and repeat the steps:
drwxr-xr-x 2 root root 1024 2008-02-22 22:22 dst
drwxr-xr-x 2 root root 1024 2008-02-22 22:22 src
-mike

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