[clang] [Driver] Link Flang runtime on Solaris (PR #65644)

[Brad Smith via cfe-commits]

brad0 wrote:

One thing to add to this. I noticed the Gnu addition does not check for `nostdlib, nodefaultlibs, or r` flags like the C++ library chunk does. With the proposed diff and what I had initially being right under the C++ chunk in the Solaris and *BSD ToolChain they would be checking for said flags.

https://github.com/llvm/llvm-project/pull/65644