Fixed broken build on GCC 4.8 due to -Wall.
Fixed broken build on GCC 4.8 due to -Wall.

With GCC 4.8, Boost fails to build from '-Wunused-local-typedefs', which
is implied by '-Wall'.

Review: https://reviews.apache.org/r/11974/

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