Implement 32-bit DO_* for arches with alignment restrictions.
Implement 32-bit DO_* for arches with alignment restrictions.

Fixes compilation for MIPS.

wlanslovenija/babeld,tcatm/babeld,woniullb/babeld,Drooids/babeld,sudomesh/babeld,boutier/babeld,jech/babeld,Gwendocg/babeldToS,Gwendocg/babeldToS,jech/babeld,wlanslovenija/babeld,dtaht/babeld-shortrtt-metrics