Fallback to legacy behavior for Configuration/Platform validation
Fallback to legacy behavior for Configuration/Platform validation

when using OutputPath without BaseOutputPath

rainersigwald/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,mono/msbuild,mono/msbuild,mono/msbuild,mono/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild