main/atop: upgrade to 2.6.0

remove atop-bb-compat.patch, fixed upstream
add fix-limits-on-ppc64le.patch to build on ppc64le
7 jobs for !16157 with atop-2.6.0 in 1 minute and 19 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #279430
docker-alpine x86_64
lint

00:00:17

 
  Build
passed #279435
docker-alpine ci-build aarch64
build-aarch64

00:00:45

passed #279436
docker-alpine ci-build armv7
build-armv7

00:00:54

passed #279434
docker-alpine ci-build ppc64le
build-ppc64le

00:00:45

passed #279433
docker-alpine ci-build s390x
build-s390x

00:00:55

passed #279432
docker-alpine ci-build x86
build-x86

00:00:31

passed #279431
docker-alpine ci-build x86_64
build-x86_64

00:00:36