component/haproxy: Build for generic CPU

While building haproxy on one machine, and using it on another, the CPU
optimisations can lead to haproxy not working at all on other CPUs.

In context of SlapOS packages are distributed in binary form, so haproxy
binary has to support all CPUs.
11 jobs for feat/slapos-sr-testing-env in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:10:26

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

04:35:01

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

01:34:10

passed SlapOS.SlapRunner.ResilienceTest-Master

00:28:09

passed SlapOS.SlapRunner.ResilienceTest-Master

00:26:08

passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:08:27

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:08:40

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2