Added compile command for 32-bit architecture.
Added compile command for 32-bit architecture.

RondaStrauch/landlab,landlab/landlab,csherwood-usgs/landlab,RondaStrauch/landlab,landlab/landlab,amandersillinois/landlab,RondaStrauch/landlab,SiccarPoint/landlab,csherwood-usgs/landlab,Carralex/landlab,ManuSchmi88/landlab,Carralex/landlab,ManuSchmi88/landlab,cmshobe/landlab,laijingtao/landlab,amandersillinois/landlab,Carralex/landlab,cmshobe/landlab,landlab/landlab,ManuSchmi88/landlab,laijingtao/landlab,cmshobe/landlab,SiccarPoint/landlab