QtScript: Don't needlessly make deep copies of function names

The QObject binding uses the function name to determine whether
a meta-method is an overload. This was implemented quite naively
by copying the name from the signature into another array before
comparing it. This could cause several unnecessary memory
allocations, since storing the name is really only needed when
there is an exception (e.g. ambiguous call).

Instead, use strncmp to compare only the relevant characters of
the original (non-copied) method signature.
This makes normal slot invocation from QtScript up to 15% faster.

Reviewed-by: Jedrzej Nowacki

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