[clang] macCatalyst: add SDKSettings.json as a dependency file if its potentially needed by the compiler (PR #178077)

[Ian Anderson via cfe-commits]

ian-twilightcoder wrote:

> @ian-twilightcoder just a heads up there are still 2 test failures on a bot: https://lab.llvm.org/buildbot/#/builders/190/builds/35141

Yeah I just saw that https://github.com/llvm/llvm-project/pull/178113

https://github.com/llvm/llvm-project/pull/178077