Added check for availability of the patch command in configure.ac.
Added check for availability of the patch command in configure.ac.

Review: https://reviews.apache.org/r/33266

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