configure ignores LDFLAGS

Summary

It seems that ./configure ignores LDFLAGS (whereas ghc-toolchain doesn't).

Steps to reproduce

LDFLAGS="-Lsomethingbogus" ./configure

You should get

There are some differences between the toolchain configured by "configure" (hadrian/cfg/default.target) and the toolchain configured by the "ghc-toolchain" program (hadrian/cfg/default.target.ghc-toolchain).

20c20
< { ccLinkProgram = Program { prgPath =  "/usr/bin/gcc" , prgFlags = ["--target=arm64-apple-darwin","-Wl,-no_fixup_chains","-Wl,-no_warn_duplicate_libraries"] }
---
> { ccLinkProgram = Program { prgPath =  "/usr/bin/gcc" , prgFlags = ["--target=arm64-apple-darwin","-Lsomethingbogus","-Wl,-no_fixup_chains","-Wl,-no_warn_duplicate_libraries"] }

Expected behavior

./configure-based toolchain configuration should also consider LDFLAGS into the cclinker program. I suppose this is not a priority because ghc-toolchain is already doing this right and we ultimately want to move toolchain configuration to it. It is yet another datapoint to hurry on the move (BTW, I think it has been two releases since ghc-toolchain is available opt-in... perhaps the time to make the move is drawing close?).

Environment

• GHC version used: HEAD

Optional:

• Operating System: macOS
• System Architecture: aarch64