dbghelp: Match the crc for debug link files in elf_locate_debug_link so that we get the correct debug file before trying to parse it.

[Robert Shearman]

Keep the debuglink elf_file_map mapped until after 
elf_new_public_symbols is called, otherwise we could use unmapped memory.
---
  dlls/dbghelp/elf_module.c |   70 
+++++++++++++++++++++++++--------------------
  1 files changed, 39 insertions(+), 31 deletions(-)
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