app: always use libunwind for symbol names in GimpBacktrace Linux backend
In the GimpBacktrace Linux backend, always use libunwind, when available, to find symbol names, even if dladdr() or libbacktrace had already found one. libunwind provides more descriptive names in certain cases, and, in particular, full symbol names for C++ lambdas. Note that, in some cases, this can result in a discrepancy between the reported symbol name, and the corresponding source location.
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