fastd: fix build with newer libsodium

fastd: fix build with newer libsodium

Add upstream patch removing aes128-ctr support that libsodium no longer
provides.

Fixes:
http://autobuild.buildroot.net/results/90c/90c526491a9eb6b5ceb38a0218fd480c03208217/
http://autobuild.buildroot.net/results/f81/f815dbfee7099f3b8fea7036e1fd10385f8c6a80/
http://autobuild.buildroot.net/results/329/3299d413ee98963e62c0df4087604c9872fcad68/

Cc: Alexander Dahl <post@lespocky.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
[Thomas: fix patch numbering, as noticed by Alexander Dahl.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>