FindGTest: Add target for gmock library

Eero Aaltonenrequested to merge
eaaltonen/cmake:target-for-gmock into master

googlemock has been absorbed into the googletest project and is built and installed from the same source tree. Add a CMake target for the gmock library in FindGTest.cmake.

In googletest version 1.8 gmock is built and installed from the same sources. In versions >= 1.8.1 upstream provides package configuration files, which usually provide the GTest::gmock (except cross-compiling with Yocto dunfell_, for some reason_).

Topic-rename: FindGTest-target-for-gmock

Edited by Brad King

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