btrfs: prohibit a operation of changing acl's mask when noacl mount option used

when used Posix File System Test Suite(pjd-fstest) to test btrfs, some cases about setfacl failed when noacl mount option used. I simplified used commands in pjd-fstest, and the following steps can reproduce it.
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# cd btrfs-part/
# mkdir aaa
# setfacl -m m::rw aaa    <- successed, but not expected by pjd-fstest.
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I checked ext3, a warning message occured, like as:
  setfacl: aaa/: Operation not supported
Certainly, it's expected by pjd-fstest.

So, i compared acl.c of btrfs and ext3. Based on that, a patch created. Fortunately, it works.

---

index da3133c..f2e09c2 100644
@@ -159,6 +159,9 @@ static int btrfs_xattr_set_acl(struct inode *inode, int type,
 	int ret;
 	struct posix_acl *acl = NULL;
 
+	if (!IS_POSIXACL(inode))
+		return -EOPNOTSUPP;
+
 	if (value) {
 		acl = posix_acl_from_xattr(value, size);
 		if (acl == NULL) {