Parsing of `extra-lib-dirs` fails if trailing comma

**Describe the bug**
If the configuration looks like this:
```
extra-lib-dirs: C:\msys64\clang64\lib,
C:\Users\Javier\bb\extra,
```

It will be passed as:
```
$ cabal build --verbose
...
--extra-lib-dirs=C:\msys64\clang64\lib,
C:\Users\Javier\bb\extra,
...
library-dirs:
C:\Users\Javier\bb\dist-newstyle\build\x86_64-windows\ghc-9.4.8\bb-0.1.0.0\build
"C:\\msys64\\clang64\\lib,\nC:\\Users\\Javier\\bb\\extra,"
```

If the last comma is removed:
```
extra-lib-dirs: C:\msys64\clang64\lib,
C:\Users\Javier\bb\extra
```
Then it works:
```
$ cabal build
...
--extra-lib-dirs=C:\msys64\clang64\lib
--extra-lib-dirs=C:\Users\Javier\bb\extra
```

**System information**
- Windows 11, MSYS2 CLANG64
- `cabal` 3.12.1.0 `ghc` any