Alexey Ochapov fd43e4dcbc gtest: fix std::is_trivially_copy_constructible for GCC 4.8 & 4.9 properly
`std::is_pod<T>` was deprecated in C++20

original (pre `is_pod`) error on GCC 4.8:
```
/fmt/test/gtest/gtest.h: In static member function 'static constexpr bool testing::internal::MatcherBase<T>::IsInlined()':
/fmt/test/gtest/gtest.h:6512:12: error: 'is_trivially_copy_constructible' was not declared in this scope
            std::is_trivially_copy_constructible<M>::value &&
            ^
/fmt/test/gtest/gtest.h:6512:45: error: expected primary-expression before '>' token
            std::is_trivially_copy_constructible<M>::value &&
                                                  ^
/fmt/test/gtest/gtest.h:6512:46: error: '::value' has not been declared
            std::is_trivially_copy_constructible<M>::value &&
                                                   ^
```
2021-04-29 07:11:49 -07:00
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