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bootstrap: Check support for unordered_map from compiler mode
Some versions of clang 5 (with libc++) have a problem with `unordered_map` under `-std=gnu++1z`: /usr/include/c++/__hash_table:1134:43: error: conflicting types for '__hash_table<_Tp, _Hash, _Equal, _Alloc>' Include `unordered_map` in our test source so that we reject this combination and fall back to an older C++ standard flag. Fixes: #17526
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