[cpptest] Get the full path to gtest_main library #9201
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The gtest framework requires two libraries:
gtestandgtest_main. The former is found viafind_library, which returns the full path to it. The latter is only added to target_link_libraries asgtest_main. Addinggtest_mainto target_link_libraries causes cmake to emit-lgtest_main, but the path to it is not provided (there is no-Lflag for it), and the link step can fail.As a fix, use
find_libraryto get the full path togtest_mainas well.