Fixed build breakage from 37e946683f1bb6a.
Fixed build breakage from 37e946683f1bb6a.

In 37e946683f1bb6a I fixed a build failure from a warning, which are
treated as errors.

Newer versions of GCC have a feature (documented here:
http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html) where unknown
warning flags are ignored.

In older version of GCC (such as 4.1 or 4.2), it appears that these flags
aren't ignored, resulting in an error.

Review: https://reviews.apache.org/r/14164

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