Install gcc-multilib in travis
Install gcc-multilib in travis

Summary:
In an effort to fix our failing Travis build, I'm following the advice in
https://github.com/travis-ci/travis-ci/issues/986 and installing
`gcc-multilib`.

Test Plan: doitlive

dpursehouse/buck,grumpyjames/buck,illicitonion/buck,liuyang-li/buck,tgummerer/buck,Distrotech/buck,rowillia/buck,neonichu/buck,JoelMarcey/buck,dushmis/buck,MarkRunWu/buck,LegNeato/buck,rowillia/buck,bocon13/buck,raviagarwal7/buck,Learn-Android-app/buck,vschs007/buck,pwz3n0/buck,rhencke/buck,Learn-Android-app/buck,k21/buck,marcinkwiatkowski/buck,LegNeato/buck,MarkRunWu/buck,mikekap/buck,dsyang/buck,Addepar/buck,janicduplessis/buck,JoelMarcey/buck,k21/buck,LegNeato/buck,stuhood/buck,OkBuilds/buck,siddhartharay007/buck,vine/buck,justinmuller/buck,hgl888/buck,OkBuilds/buck,darkforestzero/buck,brettwooldridge/buck,clonetwin26/buck,mogers/buck,Distrotech/buck,grumpyjames/buck,vschs007/buck,shybovycha/buck,rhencke/buck,LegNeato/buck,mikekap/buck,janicduplessis/buck,sdwilsh/buck,ilya-klyuchnikov/buck,mogers/buck,rmaz/buck,luiseduardohdbackup/buck,brettwooldridge/buck,vschs007/buck,JoelMarcey/buck,daedric/buck,clonetwin26/buck,vschs007/buck,pwz3n0/buck,romanoid/buck,vschs007/buck,bocon13/buck,illicitonion/buck,zhan-xiong/buck,dsyang/buck,nguyentruongtho/buck,raviagarwal7/buck,davido/buck,Dominator008/buck,robbertvanginkel/buck,Dominator008/buck,daedric/buck,marcinkwiatkowski/buck,sdwilsh/buck,romanoid/buck,neonichu/buck,rmaz/buck,1yvT0s/buck,zhuxiaohao/buck,1yvT0s/buck,stuhood/buck,janicduplessis/buck,kageiit/buck,stuhood/buck,dpursehouse/buck,clonetwin26/buck,rhencke/buck,luiseduardohdbackup/buck,LegNeato/buck,mnuessler/buck,k21/buck,k21/buck,neonichu/buck,stuhood/buck,siddhartharay007/buck,Learn-Android-app/buck,hgl888/buck,mnuessler/buck,shs96c/buck,Addepar/buck,mikekap/buck,rmaz/buck,Distrotech/buck,daedric/buck,davido/buck,shybovycha/buck,rowillia/buck,neonichu/buck,facebook/buck,Dominator008/buck,justinmuller/buck,shybovycha/buck,luiseduardohdbackup/buck,vschs007/buck,rmaz/buck,darkforestzero/buck,clonetwin26/buck,mogers/buck,shybovycha/buck,davido/buck,zpao/buck,davido/buck,daedric/buck,robbertvanginkel/buck,JoelMarcey/buck,illicitonion/buck,pwz3n0/buck,robbertvanginkel/buck,bocon13/buck,Distrotech/buck,bocon13/buck,stuhood/buck,lukw00/buck,zpao/buck,siddhartharay007/buck,liuyang-li/buck,rowillia/buck,vine/buck,marcinkwiatkowski/buck,ilya-klyuchnikov/buck,janicduplessis/buck,mnuessler/buck,1yvT0s/buck,k21/buck,JoelMarcey/buck,davido/buck,janicduplessis/buck,romanoid/buck,dsyang/buck,siddhartharay007/buck,Addepar/buck,JoelMarcey/buck,Addepar/buck,rmaz/buck,SeleniumHQ/buck,rmaz/buck,robbertvanginkel/buck,OkBuilds/buck,tgummerer/buck,k21/buck,zhan-xiong/buck,dushmis/buck,sdwilsh/buck,hgl888/buck,ilya-klyuchnikov/buck,romanoid/buck,stuhood/buck,Distrotech/buck,JoelMarcey/buck,zhan-xiong/buck,janicduplessis/buck,justinmuller/buck,SeleniumHQ/buck,janicduplessis/buck,davido/buck,hgl888/buck,rowillia/buck,rowillia/buck,Heart2009/buck,artiya4u/buck,lukw00/buck,kageiit/buck,justinmuller/buck,dushmis/buck,siddhartharay007/buck,mnuessler/buck,shybovycha/buck,mnuessler/buck,shs96c/buck,justinmuller/buck,SeleniumHQ/buck,Distrotech/buck,brettwooldridge/buck,tgummerer/buck,dushmis/buck,liuyang-li/buck,liuyang-li/buck,mikekap/buck,MarkRunWu/buck,Addepar/buck,Heart2009/buck,Addepar/buck,marcinkwiatkowski/buck,romanoid/buck,mikekap/buck,siddhartharay007/buck,zpao/buck,sdwilsh/buck,facebook/buck,dushmis/buck,shs96c/buck,OkBuilds/buck,justinmuller/buck,rowillia/buck,marcinkwiatkowski/buck,MarkRunWu/buck,darkforestzero/buck,sdwilsh/buck,dushmis/buck,vine/buck,sdwilsh/buck,LegNeato/buck,brettwooldridge/buck,liuyang-li/buck,raviagarwal7/buck,SeleniumHQ/buck,k21/buck,artiya4u/buck,dsyang/buck,zhuxiaohao/buck,artiya4u/buck,darkforestzero/buck,sdwilsh/buck,rhencke/buck,JoelMarcey/buck,mnuessler/buck,rhencke/buck,justinmuller/buck,romanoid/buck,rowillia/buck,pwz3n0/buck,zhan-xiong/buck,1yvT0s/buck,Dominator008/buck,vschs007/buck,rhencke/buck,illicitonion/buck,facebook/buck,k21/buck,Heart2009/buck,janicduplessis/buck,dpursehouse/buck,sdwilsh/buck,artiya4u/buck,dpursehouse/buck,rmaz/buck,robbertvanginkel/buck,JoelMarcey/buck,darkforestzero/buck,tgummerer/buck,luiseduardohdbackup/buck,ilya-klyuchnikov/buck,mikekap/buck,mikekap/buck,zhan-xiong/buck,k21/buck,robbertvanginkel/buck,shs96c/buck,davido/buck,Learn-Android-app/buck,pwz3n0/buck,sdwilsh/buck,mogers/buck,1yvT0s/buck,justinmuller/buck,vschs007/buck,1yvT0s/buck,LegNeato/buck,zhuxiaohao/buck,brettwooldridge/buck,luiseduardohdbackup/buck,Heart2009/buck,Heart2009/buck,marcinkwiatkowski/buck,brettwooldridge/buck,facebook/buck,zhan-xiong/buck,rmaz/buck,raviagarwal7/buck,darkforestzero/buck,darkforestzero/buck,mnuessler/buck,rhencke/buck,vschs007/buck,OkBuilds/buck,illicitonion/buck,romanoid/buck,dpursehouse/buck,sdwilsh/buck,mnuessler/buck,daedric/buck,vine/buck,mikekap/buck,dsyang/buck,lukw00/buck,raviagarwal7/buck,illicitonion/buck,Dominator008/buck,shybovycha/buck,Learn-Android-app/buck,zpao/buck,OkBuilds/buck,mikekap/buck,MarkRunWu/buck,artiya4u/buck,justinmuller/buck,nguyentruongtho/buck,1yvT0s/buck,lukw00/buck,rmaz/buck,darkforestzero/buck,grumpyjames/buck,justinmuller/buck,pwz3n0/buck,Learn-Android-app/buck,tgummerer/buck,davido/buck,nguyentruongtho/buck,grumpyjames/buck,Dominator008/buck,LegNeato/buck,neonichu/buck,grumpyjames/buck,liuyang-li/buck,Addepar/buck,Dominator008/buck,SeleniumHQ/buck,romanoid/buck,Addepar/buck,OkBuilds/buck,clonetwin26/buck,shybovycha/buck,Addepar/buck,dsyang/buck,dushmis/buck,LegNeato/buck,daedric/buck,JoelMarcey/buck,vine/buck,shs96c/buck,pwz3n0/buck,JoelMarcey/buck,grumpyjames/buck,Distrotech/buck,pwz3n0/buck,zhuxiaohao/buck,k21/buck,hgl888/buck,vine/buck,tgummerer/buck,romanoid/buck,zhan-xiong/buck,illicitonion/buck,Heart2009/buck,vschs007/buck,marcinkwiatkowski/buck,tgummerer/buck,mogers/buck,kageiit/buck,robbertvanginkel/buck,daedric/buck,Heart2009/buck,darkforestzero/buck,liuyang-li/buck,clonetwin26/buck,rmaz/buck,luiseduardohdbackup/buck,SeleniumHQ/buck,zhuxiaohao/buck,hgl888/buck,rowillia/buck,shybovycha/buck,siddhartharay007/buck,brettwooldridge/buck,shs96c/buck,luiseduardohdbackup/buck,hgl888/buck,Heart2009/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,artiya4u/buck,1yvT0s/buck,ilya-klyuchnikov/buck,Learn-Android-app/buck,artiya4u/buck,robbertvanginkel/buck,SeleniumHQ/buck,shybovycha/buck,kageiit/buck,kageiit/buck,dpursehouse/buck,raviagarwal7/buck,raviagarwal7/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,rowillia/buck,illicitonion/buck,MarkRunWu/buck,illicitonion/buck,vine/buck,raviagarwal7/buck,mogers/buck,lukw00/buck,dsyang/buck,nguyentruongtho/buck,clonetwin26/buck,rhencke/buck,rowillia/buck,robbertvanginkel/buck,illicitonion/buck,LegNeato/buck,daedric/buck,tgummerer/buck,shs96c/buck,bocon13/buck,vine/buck,janicduplessis/buck,justinmuller/buck,ilya-klyuchnikov/buck,bocon13/buck,Distrotech/buck,stuhood/buck,OkBuilds/buck,zhuxiaohao/buck,luiseduardohdbackup/buck,ilya-klyuchnikov/buck,pwz3n0/buck,liuyang-li/buck,ilya-klyuchnikov/buck,shs96c/buck,Addepar/buck,vine/buck,clonetwin26/buck,romanoid/buck,brettwooldridge/buck,daedric/buck,vine/buck,grumpyjames/buck,Dominator008/buck,tgummerer/buck,zhan-xiong/buck,siddhartharay007/buck,dsyang/buck,darkforestzero/buck,zhuxiaohao/buck,clonetwin26/buck,JoelMarcey/buck,davido/buck,Dominator008/buck,1yvT0s/buck,lukw00/buck,k21/buck,mikekap/buck,Learn-Android-app/buck,k21/buck,janicduplessis/buck,romanoid/buck,grumpyjames/buck,bocon13/buck,grumpyjames/buck,Learn-Android-app/buck,raviagarwal7/buck,raviagarwal7/buck,daedric/buck,justinmuller/buck,mikekap/buck,mogers/buck,davido/buck,justinmuller/buck,romanoid/buck,stuhood/buck,robbertvanginkel/buck,dsyang/buck,Dominator008/buck,liuyang-li/buck,mnuessler/buck,liuyang-li/buck,rhencke/buck,facebook/buck,marcinkwiatkowski/buck,shybovycha/buck,dpursehouse/buck,pwz3n0/buck,mogers/buck,mikekap/buck,sdwilsh/buck,nguyentruongtho/buck,shybovycha/buck,Distrotech/buck,LegNeato/buck,dsyang/buck,artiya4u/buck,vine/buck,shs96c/buck,nguyentruongtho/buck,hgl888/buck,MarkRunWu/buck,bocon13/buck,raviagarwal7/buck,daedric/buck,lukw00/buck,SeleniumHQ/buck,davido/buck,stuhood/buck,Distrotech/buck,lukw00/buck,lukw00/buck,rmaz/buck,kageiit/buck,bocon13/buck,zhan-xiong/buck,brettwooldridge/buck,shybovycha/buck,grumpyjames/buck,lukw00/buck,dsyang/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,dpursehouse/buck,zpao/buck,romanoid/buck,Dominator008/buck,liuyang-li/buck,clonetwin26/buck,janicduplessis/buck,nguyentruongtho/buck,rhencke/buck,Distrotech/buck,kageiit/buck,zhan-xiong/buck,darkforestzero/buck,neonichu/buck,dushmis/buck,brettwooldridge/buck,dsyang/buck,robbertvanginkel/buck,dushmis/buck,marcinkwiatkowski/buck,mogers/buck,SeleniumHQ/buck,rmaz/buck,Dominator008/buck,rowillia/buck,mogers/buck,Learn-Android-app/buck,illicitonion/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,MarkRunWu/buck,daedric/buck,zhan-xiong/buck,neonichu/buck,OkBuilds/buck,grumpyjames/buck,robbertvanginkel/buck,zpao/buck,bocon13/buck,artiya4u/buck,dushmis/buck,LegNeato/buck,SeleniumHQ/buck,shs96c/buck,davido/buck,artiya4u/buck,stuhood/buck,illicitonion/buck,vschs007/buck,bocon13/buck,shs96c/buck,SeleniumHQ/buck,Addepar/buck,vschs007/buck,zhuxiaohao/buck,rmaz/buck,ilya-klyuchnikov/buck,rhencke/buck,daedric/buck,robbertvanginkel/buck,sdwilsh/buck,illicitonion/buck,OkBuilds/buck,tgummerer/buck,facebook/buck,sdwilsh/buck,grumpyjames/buck,Heart2009/buck,shs96c/buck,vschs007/buck,tgummerer/buck,raviagarwal7/buck,luiseduardohdbackup/buck,artiya4u/buck,OkBuilds/buck,lukw00/buck,SeleniumHQ/buck,Learn-Android-app/buck,neonichu/buck,siddhartharay007/buck,clonetwin26/buck,stuhood/buck,zhan-xiong/buck,pwz3n0/buck,brettwooldridge/buck,k21/buck,dsyang/buck,davido/buck,Addepar/buck,LegNeato/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,Addepar/buck,zhuxiaohao/buck,zpao/buck,OkBuilds/buck,facebook/buck,darkforestzero/buck,janicduplessis/buck,bocon13/buck,zhan-xiong/buck,hgl888/buck,raviagarwal7/buck,OkBuilds/buck,clonetwin26/buck,shs96c/buck,mogers/buck,darkforestzero/buck,neonichu/buck,clonetwin26/buck,shybovycha/buck,marcinkwiatkowski/buck