[clang-cl] Don't expand /permissive- to /ZC:strictStrings yet

Follow up on rGc70b0e808da8

/Zc:strictStrings is an alias to an option part of the -W group. When the driver tries to render the option back to a string for the cc1 invocation, it sadly gets rendered with the original spelling instead of the alias, causing issues reported here: https://reviews.llvm.org/D103773#inline-989447

I am thinking it's the best to revert this part of the patch until I figured out how to correctly add the arg and until /Zc:strictStrings- exists/is needed.