Remove long deprecated methods from Linker

- Linker::makeBrokenLink() (deprecated in 1.16)
- Linker::makeBrokenLinkObj() (deprecated in 1.16)
- Linker::makeColouredLinkObj() (deprecated in 1.16)
- Linker::makeSizeLinkObj() (deprecated in 1.17)

Change-Id: I230096cbf964cdff980f33f76790a524d318408d
Merge "Remove long deprecated methods from Linker"