Updating external-gmock to download from github
Updating external-gmock to download from github

Even though it says it's buildign gmock, it is in fact only building
gtest at this point in time.

In the future, we can update the external-project to download
gtest 1.8 which once again includes gmock.

clMathLibraries/clSPARSE,kknox/clSPARSE,ghisvail/clSPARSE,kknox/clSPARSE,clMathLibraries/clSPARSE,ghisvail/clSPARSE