[poppler] [RFC] Replace GooHash by std::unordered_map

[Adam Reichold]

Hello,

the attached patch replaced Poppler's internal hash table implementation
GooHash by std::unordered_map found in the C++ standard library since
C++11. This continues Poppler's slow drift towards standard library
containers and removes one of the home-grown data structures with the
main goals of reducing code size and improving the long term
maintainability of the code base.

Best regards, Adam.
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