Compilation fix: Remove redefinition for std::is_same_v()

[mythrocks]

With nvcc-11.2 + gcc-10.2, one sees the following compilation errors in type_list_tests.cpp:

../tests/utilities_tests/type_list_tests.cpp:24:16: error: redefinition of ‘template<class T, class U> constexpr const bool std::is_same_v’
   24 | constexpr bool is_same_v = std::is_same<T, U>::value;
      |                ^~~~~~~~~
In file included from /usr/include/c++/10/bits/move.h:57,
                 from /usr/include/c++/10/bits/stl_pair.h:59,
                 from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/memory:63,
                 from _deps/gtest-src/googletest/include/gtest/internal/gtest-port.h:251,
                 from _deps/gtest-src/googletest/include/gtest/internal/gtest-type-util.h:47,
                 from ../include/cudf_test/cudf_gtest.hpp:42,
                 from ../tests/utilities_tests/type_list_tests.cpp:17:
/usr/include/c++/10/type_traits:3182:25: note: ‘template<class _Tp, class _Up> constexpr const bool std::is_same_v<_Tp, _Up>’ previously declared here
 3182 |   inline constexpr bool is_same_v = _GLIBCXX_BUILTIN_IS_SAME_AS(_Tp, _Up);
      |                         ^~~~~~~~~

I'm not sure why this doesn't turn up with gcc-9, even though we're using --std=c++17 on both.

This commit removes the redefinition of is_same_v().

[mythrocks]

Failure seems transient, and unrelated to the change:

09:58:18 Setting commit status on GitHub for https://github.com/rapidsai/cudf/commit/fc324412838ac413f898f1b639885f8522769150
09:58:55 ERROR: Build step failed with exception
09:58:55 java.net.SocketTimeoutException: timeout
09:58:55 	at okhttp3.internal.http2.Http2Stream$StreamTimeout.newTimeoutException(Http2Stream.java:678)
09:58:55 	at okhttp3.internal.http2.Http2Stream$StreamTimeout.exitAndThrowIfTimedOut(Http2Stream.java:686)
09:58:55 	at okhttp3.internal.http2.Http2Stream.takeHeaders(Http2Stream.java:154)
09:58:55 	at okhttp3.internal.http2.Http2ExchangeCodec.readResponseHeaders(Http2ExchangeCodec.java:136)
09:58:55 	at okhttp3.internal.connection.Exchange.readResponseHeaders(Exchange.java:115)
09:58:55 	at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:94)
...

Re-kicking... Will re-kick after higher priority bugs have been merged.

[rgsl888prabhu]

Looks good, update copyright.

[kkraus14]

@gpucibot merge

[kkraus14]

rerun tests

[mythrocks]

Looks good, update copyright

Argh! Sorry I missed the copyright. Any objection to my pushing a fix to this?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-21.06@cbbcba7). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             branch-21.06    #8369   +/-   ##
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  Coverage                ?   82.86%           
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  Files                   ?      106           
  Lines                   ?    17874           
  Branches                ?        0           
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  Hits                    ?    14811           
  Misses                  ?     3063           
  Partials                ?        0           

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[mythrocks]

Thanks for the reviews, all.