[llvm] [llvm-rc] Concatenate consecutive string tokens in windres mode (PR #68685)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Btw, I just recently saw http://www.os2museum.com/wp/from-the-annals-of-preprocessor-hackery/ which touches upon this exact issue, and the lengths some people have gone to, to work around the fact that MS rc.exe doesn't concatenate consecutive string tokens in general.

https://github.com/llvm/llvm-project/pull/68685