build: drop arch-deps on infiniband libs as they are pervasive
build: drop arch-deps on infiniband libs as they are pervasive

Thanks to Dominic Hargreaves for the tip, and i386 testing, in
Debian bug #974704.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp