BUILD.bazel: Add CXX_OPTS to specify -std=c++14 when needed #4100
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Googletest requires a C++14 compiler.
But Bazel can default to givin GCC option -std=c++0x which is unable to compile googletest.
Specify -std=c++14 for any compiler that isn't MSVC and isn't on QNX. I don't know what C++ compiler Bazel invokes for QNX.
Fixes: #4098