Fix a horrible performance regression caused by missing & #3422
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One of the busiest functions in rpm was getting passed a new copy of a big unordered_map on each call during fingerprinting because "somebody" forgot a & in commit 08a6a5e. This isn't even noticeable in the test-suite or daily "update a few dozen packages" operation but when attempting to install/update a few thousand packages dragged this little buglet to the light...
Why oh why C++ do you behave in such an idiotic manner in the face of stupid mistakes. Raw pointers at least give you a compiler error.