[Bug 2064187] [NEW] llvm-18-linker-tools does not include LLVMgold.so

[Paul Meckel]

Public bug reported:

Unlike all other llvm-*-linker-tools packages, this one does not install `/usr/lib/llvm-18/lib/LLVMgold.so`. It does however install a broken symlink to it at `/usr/lib/bfd-plugins/LLVMgold-18.so`
This results in compilation failures with clang++ when used with the `-flto` flag for link time optimization.

To reproduce:

main.cpp:
```c++
int main() { return 0; }
```

```bash
clang++ -flto main.cpp -o main
```

Results in:
```
/usr/bin/ld: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
```

Package version is

llvm-18-linker-tools/noble,now 1:18.1.3-1 amd64

llvm-18-linker-tools:
  Installed: 1:18.1.3-1
  Candidate: 1:18.1.3-1
  Version table:
 *** 1:18.1.3-1 500
        500 http://de.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: llvm-toolchain-18 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2064187

Title:
  llvm-18-linker-tools does not include LLVMgold.so

Status in llvm-toolchain-18 package in Ubuntu:
  New

Bug description:
  Unlike all other llvm-*-linker-tools packages, this one does not install `/usr/lib/llvm-18/lib/LLVMgold.so`. It does however install a broken symlink to it at `/usr/lib/bfd-plugins/LLVMgold-18.so`
  This results in compilation failures with clang++ when used with the `-flto` flag for link time optimization.

  To reproduce:

  main.cpp:
  ```c++
  int main() { return 0; }
  ```

  ```bash
  clang++ -flto main.cpp -o main
  ```

  Results in:
  ```
  /usr/bin/ld: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  ```

  Package version is

  llvm-18-linker-tools/noble,now 1:18.1.3-1 amd64

  llvm-18-linker-tools:
    Installed: 1:18.1.3-1
    Candidate: 1:18.1.3-1
    Version table:
   *** 1:18.1.3-1 500
          500 http://de.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
          100 /var/lib/dpkg/status

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