`GLOG_LIBRARYRARY_DIRS` appears to be in error

[jsoref]

The only instance of GLOG_LIBRARYRARY_DIRS is here: https://github.com/BVLC/caffe/blob/9b891540183ddc834a02b2bd81b31afae71b2153/cmake/Modules/FindGlog.cmake#L10

I can't figure out what it's trying to reference.

Note that I'm not actually looking at this repository (I'll queue that task, but I have a bottomless list) -- I'm only flagging this because I tripped on it in another repository that referenced this file's origin.

[dragonQian]

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