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libmount: use mount(2) for remount on Linux < 5.14

It seems mount_setattr() is supported on Linux < 5.14, but it's without
MOUNT_ATTR_NOSYMFOLLOW. That's problem for remount where we reset all
VFS flags.

The most simple (but not elegant) is to check for kernel version and
fallback to mount(2) on remount.

Addresses: https://github.com/util-linux/util-linux/issues/2283
Signed-off-by: Karel Zak <kzak@redhat.com>

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