dbghelp: fix debuglink crash, accessing memory after munmap

[Peter Oberndorfer]

Winedbg would crash on my system when trying to set a breakpoint (loading the debug info from a .debug file)
The problem is that hash_table_elt adds the symbols of the .debug file to the hashtable of the parent file.
But at the time elf_new_public_symbols is run, the sections of the .debug file are already unmapped.
In addition to that the symbols in .debug would be added 2 times (.so and .debug file)

Changelog:
dbghelp: fix debuglink crash, accessing memory after munmap
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