[clang] [Clang][Driver] Revise Cygwin ToolChain to call linker directly (PR #147960)

[Tomohiro Kashiwada via cfe-commits]

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kikairoya wrote:

https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

> Inconsistent bracing within if/else if/else chains (if one block requires braces, all must)

https://github.com/llvm/llvm-project/pull/147960