[clang] [Driver][DragonFly] Fixes for linker path and command-line option handling (PR #69095)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> This appears to have broken some bots: https://lab.llvm.org/buildbot/#/builders/119/builds/15633 https://lab.llvm.org/buildbot/#/builders/60/builds/14449
> 
> Can you investigate and get those bots back to green?

Ping?

https://github.com/llvm/llvm-project/pull/69095