[binutils-gdb] bfd: don't produce corrupt COFF symbol table due to long ELF file name symbols

[sergiodj+buildbot at redhat dot com]

*** TEST RESULTS FOR COMMIT 270f824531ceef276616a5d2f3027fa9f537c10b ***

Author: Jan Beulich <jbeulich@novell.com>
Branch: master
Commit: 270f824531ceef276616a5d2f3027fa9f537c10b

bfd: don't produce corrupt COFF symbol table due to long ELF file name symbols

The re-writing logic in _bfd_coff_final_link() overwrote the ".file"
part of the symbol table entry, due to not coping with the auxiliary
entry generated in all cases.

Note that while I would have wanted to add a test case,
(a) I didn't spot any one testing the base functionality here, and
(b) I wasn't able to figure out proper conditionals to use in e.g.
    ld-elf/elf.exp to check for the necessary PE/PE+ support (which
    varies by target).