Rebuild Xcode symlink trees on Buck version change
Rebuild Xcode symlink trees on Buck version change

Summary:
  * If the Buck version changes, rebuild all header symlink trees we create when
    we generate an Xcode project. This makes sure that the trees are up to date
    even if the logic that builds them changes.

Test Plan:
  * Use a different Buck version, check that all header symlink trees are
    recreated even if their contents do not change.

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