install_mirror_package: When arch is set, install both native and arch
install_mirror_package: When arch is set, install both native and arch

This is necessary as dpkg multiarch does not allow mismatching versions
on different architectures (e.g. you cannot have libsbc1-1.0:i386 and
libsbc1-1.1:amd64 installed at the same time).

Even --force-all in dpkg does not allow that.

We fix the problem by installing both packages at the same time in
install_mirror_package.

DanDanBu/crouton,dragon788/chroagh,mkasick/crouton,tedm/crouton,fxcebx/crouton,arbuztw/crouton,rperce/chroagh,arbuztw/crouton,StrawnPoint04/crouton,armgong/chroagh,fxcebx/crouton,Timvrakas/crouton,djmrr/crouton,StrawnPoint04/crouton,twmccart/crouton,JDGBOLT/chroagh,elkangaroo/chroagh,rperce/chroagh,zofuthan/crouton,elkangaroo/chroagh,zofuthan/crouton,brayniac/crouton,DanDanBu/crouton,armgong/chroagh,nromsdahl/crouton,stephen-soltesz/crouton,JDGBOLT/chroagh,arbuztw/crouton,tedm/crouton,arbuztw/crouton,fxcebx/crouton,nromsdahl/crouton,mkasick/crouton,ikaritw/crouton,VandeurenGlenn/crouton,mkasick/crouton,mkasick/crouton,dragon788/chroagh,rperce/chroagh,elkangaroo/chroagh,arbuztw/crouton,elkangaroo/chroagh,taterbase/crouton,JDGBOLT/chroagh,dnschneid/crouton,brayniac/crouton,jamgregory/crouton,taterbase/crouton,tedm/crouton,VandeurenGlenn/crouton,armgong/chroagh,jamgregory/crouton,arbuztw/crouton,djmrr/crouton,elkangaroo/chroagh,dnschneid/crouton,zofuthan/crouton,Timvrakas/crouton,brayniac/crouton,jamgregory/crouton,tonyxue/cruise,fxcebx/crouton,marriop/newCrouton,Timvrakas/crouton,tedm/crouton,ikaritw/crouton,StrawnPoint04/crouton,brayniac/crouton,dragon788/chroagh,jamgregory/crouton,stephen-soltesz/crouton,zofuthan/crouton,nromsdahl/crouton,Timvrakas/crouton,JDGBOLT/chroagh,mkasick/crouton,ikaritw/crouton,StrawnPoint04/crouton,JDGBOLT/chroagh,Timvrakas/crouton,DanDanBu/crouton,armgong/chroagh,taterbase/crouton,marriop/newCrouton,jamgregory/crouton,StrawnPoint04/crouton,DanDanBu/crouton,twmccart/crouton,twmccart/crouton,fxcebx/crouton,djmrr/crouton,nromsdahl/crouton,tonyxue/cruise,zofuthan/crouton,Timvrakas/crouton,dnschneid/crouton,tonyxue/cruise,armgong/chroagh,brayniac/crouton,dragon788/chroagh,twmccart/crouton,tonyxue/cruise,VandeurenGlenn/crouton,twmccart/crouton,nromsdahl/crouton,rperce/chroagh,dragon788/chroagh,mkasick/crouton,djmrr/crouton,DanDanBu/crouton,tonyxue/cruise,tedm/crouton,marriop/newCrouton,fxcebx/crouton,twmccart/crouton,djmrr/crouton,taterbase/crouton,dnschneid/crouton,tedm/crouton,djmrr/crouton,VandeurenGlenn/crouton,DanDanBu/crouton,stephen-soltesz/crouton,stephen-soltesz/crouton,rperce/chroagh,ikaritw/crouton,tonyxue/cruise,VandeurenGlenn/crouton,VandeurenGlenn/crouton,armgong/chroagh,StrawnPoint04/crouton,dnschneid/crouton,taterbase/crouton,brayniac/crouton,dnschneid/crouton,JDGBOLT/chroagh,jamgregory/crouton,taterbase/crouton,rperce/chroagh,dragon788/chroagh,zofuthan/crouton,ikaritw/crouton,nromsdahl/crouton,ikaritw/crouton,elkangaroo/chroagh,stephen-soltesz/crouton,stephen-soltesz/crouton