Build breaks when adding to ComputeCompileInputsTargets because FixupCLCompileOptions doesn't run at the end #741

cppwinrt injects targets in ComputeCompileInputsTargets to add some logic to the build. Because cppwinrt appends to this variable, the cppwinrt target will run after FixupCLCompileOptions, which breaks the build in some cases: FixupCLCompileOptions is supposed to convert /MP to /FS

Related: https://developercommunity.visualstudio.com/content/problem/1167617/build-breaks-when-adding-to-computecompileinputsta.html