Nightly GitHub Action failure: implicit declaration of function 'arc4random_uniform'

[Robert Scheck]

Our nightly GitHub Action for the container image fails since yesterday with:

86.51    85 | } ASN1_SEQUENCE_END(Manifest);
86.51       |                     ^~~~~~~~
86.63 mft.c: In function 'mft_parse_filehash':
86.64 mft.c:264:27: error: implicit declaration of function 'arc4random_uniform' [-Werror=implicit-function-declaration]
86.64   264 |                 new_idx = arc4random_uniform(p->res->filesz + 1);
86.64       |                           ^~~~~~~~~~~~~~~~~~
87.23 cc1: some warnings being treated as errors
87.23 make[1]: *** [Makefile:792: rpki_client-mft.o] Error 1

[Theo Buehler]

Fixed via #95