Set traits to be skipped so that PlatformSpecific test attributes will work
Set traits to be skipped so that PlatformSpecific test attributes will work

rainersigwald/msbuild,sean-gilliam/msbuild,mono/msbuild,jeffkl/msbuild,cdmihai/msbuild,jeffkl/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,mono/msbuild,chipitsine/msbuild,cdmihai/msbuild,jeffkl/msbuild,rainersigwald/msbuild,Microsoft/msbuild,AndyGerlicher/msbuild,chipitsine/msbuild,chipitsine/msbuild,mono/msbuild,Microsoft/msbuild,Microsoft/msbuild,cdmihai/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,Microsoft/msbuild,jeffkl/msbuild,mono/msbuild