version up: rust 1.47.0, llvm 11.0.0

This also fixes rpath of rust binaries.
4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:30:25

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:09:15

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

07:30:34

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:52:48