testing/pure-ftpd: add unicode support

Build pure-ftpd with unicode support.
pure-ftpd can't read files with Unicode characters without Unicode
support and Unicode is more or less the standard encoding nowadays.
7 jobs for !18668 with optix2000-master-patch-55092 in 51 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Lint
passed #331077
docker-alpine x86_64
lint

00:00:11

 
  Build
failed #331082
docker-alpine ci-build aarch64
build-aarch64

00:00:07

failed #331083
docker-alpine ci-build armv7
build-armv7

00:00:14

failed #331081
docker-alpine ci-build ppc64le
build-ppc64le

00:00:08

failed #331080
docker-alpine ci-build s390x
build-s390x

00:00:08

failed #331079
docker-alpine ci-build x86
build-x86

00:00:05

failed #331078
docker-alpine ci-build x86_64
build-x86_64

00:00:04

 
Name Stage Failure
failed
build-s390x Build
No job log
failed
build-x86_64 Build
No job log
failed
build-x86 Build
No job log
failed
build-ppc64le Build
No job log
failed
build-aarch64 Build
No job log
failed
build-armv7 Build
No job log