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Add GTEST_HAS_PTHREAD to GTest::* target interfaces

3

Add -DGTEST_HAS_PTHREAD=0/1 compiler flag to GTest::* CMake targets as pkg-config do. Using CMake find_package my code compiled & linked smoothly but SIGSEGV when executed. Setting macro in CMAKE_CXX_FLAGS fixed it....

Vector#histogram fails to populate histogram when bins parameter is an Array. Proposed fix pull request #67 .