main/rng-tools: fix build on ppc64le

fix nameclash with posix encrypt(3)
7 jobs for !7204 with rng-tools-6.10 in 1 minute and 34 seconds
detached
Status Job ID Name Coverage
  Lint
failed #104348
docker-alpine x86_64 allowed to fail
lint

00:00:21

 
  Build
passed #104353
docker-alpine ci-build aarch64
build-aarch64

00:01:06

passed #104354
docker-alpine ci-build armv7
build-armv7

00:01:12

passed #104352
docker-alpine ci-build ppc64le
build-ppc64le

00:01:05

passed #104351
docker-alpine ci-build s390x
build-s390x

00:00:31

passed #104350
docker-alpine ci-build x86
build-x86

00:00:34

passed #104349
docker-alpine ci-build x86_64
build-x86_64

00:00:35

 
Name Stage Failure
failed
lint Lint
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