package/mrouted: bump to version 4.1

package/mrouted: bump to version 4.1

- Use official tarball
- Update license hash, reformatting:
  https://github.com/troglobit/mrouted/commit/206f9325608d2f538254e26848aeb9bfb32e07e5
- Switch to autotools, available since version 4.0 and
  https://github.com/troglobit/mrouted/commit/1a7ef3759f49195db176667e73879f1ba9514527
- Install systemd file, available since version 4.0 and
  https://github.com/troglobit/mrouted/commit/18f0fe763076ff735981d9499b68df68b0e1a8db
- Update indentation in hash file (two spaces)

https://github.com/troglobit/mrouted/releases/tag/4.1

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>