Use `buck-out/gen` dir for PEX output
Use `buck-out/gen` dir for PEX output

Summary: Instead of the scratch dir, `buck-out/bin`.

Test Plan: `buck test --all`

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