[Debian-med-packaging] arb is marked for autoremoval from testing

[Debian testing autoremoval watch]

arb 6.0.6-4 is marked for autoremoval from testing on 2019-01-22

It (build-)depends on packages with these RC bugs:
916024: pocl: pocl FTBFS: symbol differences
917244: pocl: FTBFS on armel: clang: error: the clang compiler does not support '-march=arm946e-s'