package/htop: bump to 2.1.0
No upstream hash provided with this release [1].
Add licence file hash.
[1] http://www.freelists.org/post/htop/ANN-htop-210
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>