Push buck into headless mode.
Push buck into headless mode.

Summary:
With the change to use jython, _something_ is causing AWT to be initialized. This is causing buck to appear as an AWT app, with its own menu bar in OS X. Stop that by indicating that we're headless.

Note: this will cause problems if we ever do anything using AWT, so we might want this to be an option in a later diff. Having said that: who uses the AWT these days?

Test Plan:
buck build buck
Watch as nothing untoward happens

Learn-Android-app/buck,romanoid/buck,hgl888/buck,dsyang/buck,neonichu/buck,daedric/buck,thinkernel/buck,siddhartharay007/buck,zhuxiaohao/buck,daedric/buck,daedric/buck,bocon13/buck,justinmuller/buck,rowillia/buck,rmaz/buck,k21/buck,sdwilsh/buck,rmaz/buck,dsyang/buck,zhan-xiong/buck,Addepar/buck,romanoid/buck,shs96c/buck,Distrotech/buck,Learn-Android-app/buck,marcinkwiatkowski/buck,lukw00/buck,luiseduardohdbackup/buck,belomx/open_tools,darkforestzero/buck,clonetwin26/buck,k21/buck,JoelMarcey/buck,Learn-Android-app/buck,robbertvanginkel/buck,mikekap/buck,grumpyjames/buck,daedric/buck,vschs007/buck,shybovycha/buck,tgummerer/buck,zhuxiaohao/buck,rowillia/buck,justinmuller/buck,tgummerer/buck,rowillia/buck,zhan-xiong/buck,clonetwin26/buck,mnuessler/buck,rmaz/buck,marcinkwiatkowski/buck,liuyang-li/buck,raviagarwal7/buck,illicitonion/buck,JoelMarcey/buck,Addepar/buck,mnuessler/buck,sdwilsh/buck,brettwooldridge/buck,marcinkwiatkowski/buck,OkBuilds/buck,janicduplessis/buck,LegNeato/buck,neonichu/buck,jackminicloud/buck,dsyang/buck,illicitonion/buck,shs96c/buck,illicitonion/buck,LegNeato/buck,vschs007/buck,illicitonion/buck,mogers/buck,zhuxiaohao/buck,k21/buck,JoelMarcey/buck,neonichu/buck,SeleniumHQ/buck,mnuessler/buck,raviagarwal7/buck,Distrotech/buck,rmaz/buck,clonetwin26/buck,dsyang/buck,romanoid/buck,davido/buck,Distrotech/buck,rowillia/buck,illicitonion/buck,OkBuilds/buck,k21/buck,robbertvanginkel/buck,thinkernel/buck,JoelMarcey/buck,raviagarwal7/buck,OkBuilds/buck,davido/buck,tgummerer/buck,shybovycha/buck,Learn-Android-app/buck,shybovycha/buck,daedric/buck,siddhartharay007/buck,Addepar/buck,saleeh93/buck-cutom,brettwooldridge/buck,MarkRunWu/buck,1yvT0s/buck,denizt/buck,LegNeato/buck,Addepar/buck,JoelMarcey/buck,grumpyjames/buck,rhencke/buck,darkforestzero/buck,raviagarwal7/buck,liuyang-li/buck,LegNeato/buck,Dominator008/buck,LegNeato/buck,darkforestzero/buck,luiseduardohdbackup/buck,clonetwin26/buck,liuyang-li/buck,vschs007/buck,JoelMarcey/buck,hgl888/buck,artiya4u/buck,zhan-xiong/buck,dsyang/buck,Dominator008/buck,dushmis/buck,bocon13/buck,davido/buck,illicitonion/buck,Heart2009/buck,facebook/buck,darkforestzero/buck,Dominator008/buck,stuhood/buck,lukw00/buck,vschs007/buck,justinmuller/buck,hgl888/buck,rmaz/buck,rhencke/buck,brettwooldridge/buck,sdwilsh/buck,clonetwin26/buck,justinmuller/buck,shs96c/buck,siddhartharay007/buck,facebook/buck,ilya-klyuchnikov/buck,raviagarwal7/buck,darkforestzero/buck,brettwooldridge/buck,liuyang-li/buck,zhan-xiong/buck,bocon13/buck,vine/buck,shybovycha/buck,rmaz/buck,Addepar/buck,jackminicloud/buck,sdwilsh/buck,robbertvanginkel/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,zpao/buck,kageiit/buck,dushmis/buck,ilya-klyuchnikov/buck,romanoid/buck,GerritCodeReview/buck,vschs007/buck,clonetwin26/buck,shybovycha/buck,raviagarwal7/buck,davido/buck,thinkernel/buck,hgl888/buck,Addepar/buck,dushmis/buck,justinmuller/buck,shybovycha/buck,robbertvanginkel/buck,liuyang-li/buck,belomx/open_tools,lukw00/buck,GerritCodeReview/buck,rowillia/buck,raviagarwal7/buck,denizt/buck,clonetwin26/buck,zpao/buck,zhan-xiong/buck,janicduplessis/buck,dsyang/buck,mread/buck,GerritCodeReview/buck,dsyang/buck,zhuxiaohao/buck,stuhood/buck,mread/buck,grumpyjames/buck,k21/buck,davido/buck,sdwilsh/buck,raviagarwal7/buck,rmaz/buck,k21/buck,neonichu/buck,lukw00/buck,Heart2009/buck,stuhood/buck,SeleniumHQ/buck,azatoth/buck,vschs007/buck,Heart2009/buck,liuyang-li/buck,ilya-klyuchnikov/buck,artiya4u/buck,Addepar/buck,mread/buck,Learn-Android-app/buck,lukw00/buck,rmaz/buck,SeleniumHQ/buck,clonetwin26/buck,shybovycha/buck,Learn-Android-app/buck,zhuxiaohao/buck,grumpyjames/buck,Distrotech/buck,bocon13/buck,Distrotech/buck,grumpyjames/buck,janicduplessis/buck,robbertvanginkel/buck,Addepar/buck,mnuessler/buck,OkBuilds/buck,luiseduardohdbackup/buck,liuyang-li/buck,mikekap/buck,davido/buck,1yvT0s/buck,raviagarwal7/buck,zpao/buck,raviagarwal7/buck,saleeh93/buck-cutom,1yvT0s/buck,justinmuller/buck,janicduplessis/buck,marcinkwiatkowski/buck,romanoid/buck,mikekap/buck,SeleniumHQ/buck,dushmis/buck,vine/buck,tgummerer/buck,rhencke/buck,zpao/buck,lukw00/buck,dushmis/buck,janicduplessis/buck,mnuessler/buck,dsyang/buck,justinmuller/buck,stuhood/buck,darkforestzero/buck,zpao/buck,clonetwin26/buck,dpursehouse/buck,zhan-xiong/buck,kageiit/buck,sdwilsh/buck,ilya-klyuchnikov/buck,Distrotech/buck,pwz3n0/buck,pwz3n0/buck,JoelMarcey/buck,vine/buck,denizt/buck,facebook/buck,zhan-xiong/buck,marcinkwiatkowski/buck,rhencke/buck,MarkRunWu/buck,dsyang/buck,k21/buck,hgl888/buck,zpao/buck,romanoid/buck,shybovycha/buck,dushmis/buck,dushmis/buck,facebook/buck,artiya4u/buck,Distrotech/buck,illicitonion/buck,OkBuilds/buck,zpao/buck,vschs007/buck,illicitonion/buck,pwz3n0/buck,kageiit/buck,rhencke/buck,1yvT0s/buck,mogers/buck,zhuxiaohao/buck,pwz3n0/buck,darkforestzero/buck,denizt/buck,ilya-klyuchnikov/buck,robbertvanginkel/buck,lukw00/buck,sdwilsh/buck,dpursehouse/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,siddhartharay007/buck,lukw00/buck,vine/b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