flags on symlinks not synced by fileflags.diff

[uroehm]

The --fileflags patch does not support file flags on symlinks.

Environment: rsync 3.2.7 from Homebrew (Jan 2023), macOS 13.2, arm64

To reproduce (on macOS):

mkdir src dst
touch src/testfile
ln -s src/testfile src/testlink
chflags hidden src/testfile    
chflags -h nodump src/testlink
rsync -aN --fileflags src/ dst

ls -alO  src/   dst/
src:
total 0
drwxr-xr-x   4 testuser  staff  -      128 12 Feb 19:29 .
drwxr-xr-x@ 23 testuser  staff  -      736 12 Feb 19:29 ..
-rw-r--r--   1 testuser  staff  hidden   0 12 Feb 19:29 testfile
lrwxr-xr-x   1 testuser  staff  nodump  12 12 Feb 19:29 testlink -> src/testfile
dst:
total 0
drwxr-xr-x   4 testuser  staff  -      128 12 Feb 19:29 .
drwxr-xr-x@ 23 testuser  staff  -      736 12 Feb 19:29 ..
-rw-r--r--   1 testuser  staff  hidden   0 12 Feb 19:29 testfile
lrwxr-xr-x   1 testuser  staff  -       12 12 Feb 19:29 testlink -> src/testfile