binutils-unwrapped-all-targets: fix libctf breakage
binutils-unwrapped-all-targets: fix libctf breakage

Before the change 'postFixup' was breaking binaries as it deleted `libctf.so`'s
dependency without fixing the links (https://hydra.nixos.org/build/173957444):

  objdump:
    symbol lookup error: ...-binutils-2.38/lib/libctf.so.0: undefined symbol: htab_eq_string

Instead of tying binutils and libbfd together let's stop replacing the
libraries and use local copies. They are not mechanically interchangeable.

Ideally binutils' upstream build system should allow linking external
`libbfd`/`libopcodes`/`libctf` but we are not there yet.

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