Fixed line in '3rdParty/Makefile.am' that had potential to 'rm -rf /'.
Fixed line in '3rdParty/Makefile.am' that had potential to 'rm -rf /'.

Review: https://reviews.apache.org/r/49603/

verizonlabs/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,zmalik/mesos,reneploetz/mesos,reneploetz/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,abudnik/mesos,gsantovena/mesos,zmalik/mesos,reneploetz/mesos,gsantovena/mesos,kaysoky/mesos,kaysoky/mesos,dforsyth/mesos,andschwa/mesos,kaysoky/mesos,Gilbert88/mesos,zmalik/mesos,yuquanshan/customizedMesos,yuquanshan/customizedMesos,zmalik/mesos,jpeach/mesos,verizonlabs/mesos,abudnik/mesos,zmalik/mesos,asamerh4/mesos,asamerh4/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,asamerh4/mesos,verizonlabs/mesos,andschwa/mesos,craimbert/mesos,abudnik/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,Gilbert88/mesos,jpeach/mesos,verizonlabs/mesos,dforsyth/mesos,yuquanshan/customizedMesos,abudnik/mesos,neilconway/mesos,yuquanshan/customizedMesos,Gilbert88/mesos,yuquanshan/customizedMesos,neilconway/mesos,zmalik/mesos,chhsia0/mesos,jpeach/mesos,craimbert/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,andschwa/mesos,kaysoky/mesos,dforsyth/mesos,kaysoky/mesos,reneploetz/mesos,andschwa/mesos,abudnik/mesos,reneploetz/mesos,kaysoky/mesos,jpeach/mesos,chhsia0/mesos,chhsia0/mesos,chhsia0/mesos,chhsia0/mesos,verizonlabs/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,abudnik/mesos,jpeach/mesos,jpeach/mesos,dforsyth/mesos,gsantovena/mesos,craimbert/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,gsantovena/mesos,chhsia0/mesos,Aman-Jain-14/customizedMesos,gsantovena/mesos,andschwa/mesos,gsantovena/mesos,gsantovena/mesos,asamerh4/mesos,verizonlabs/mesos,neilconway/mesos,Gilbert88/mesos,craimbert/mesos,dforsyth/mesos,neilconway/mesos,abudnik/mesos,dforsyth/mesos,asamerh4/mesos,andschwa/mesos,craimbert/mesos,asamerh4/mesos,neilconway/mesos,Gilbert88/mesos,chhsia0/mesos,kaysoky/mesos,Gilbert88/mesos,craimbert/mesos,zmalik/mesos,reneploetz/mesos