package/rng-tools: bump to version 6.11

Drop patches (already in version)

https://github.com/nhorman/rng-tools/releases/tag/V6.11



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>