Fixed GLog linking with debug targets.
Fixed GLog linking with debug targets.

When building with debug symbols, the GLog library will be called
'libglogd' instead of 'libglog'. This is resolved by adding a suffix,
similar to how it's already done for the Protocol Buffers library.

Review: https://reviews.apache.org/r/71198/

abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,Gilbert88/mesos,chhsia0/mesos,chhsia0/mesos,dforsyth/mesos,chhsia0/mesos,kaysoky/mesos,Gilbert88/mesos,Gilbert88/mesos,abudnik/mesos,dforsyth/mesos,Gilbert88/mesos,reneploetz/mesos,kaysoky/mesos,reneploetz/mesos,dforsyth/mesos,chhsia0/mesos,Gilbert88/mesos,kaysoky/mesos,chhsia0/mesos,Gilbert88/mesos,kaysoky/mesos,dforsyth/mesos,kaysoky/mesos,kaysoky/mesos,reneploetz/mesos,chhsia0/mesos,reneploetz/mesos,reneploetz/mesos,abudnik/mesos,abudnik/mesos,dforsyth/mesos,abudnik/mesos,chhsia0/mesos,dforsyth/mesos,dforsyth/mesos,reneploetz/mesos,kaysoky/mesos,abudnik/mesos,abudnik/mesos