CommandLineBuilder.FixCommandLineSwitch: Remove this completely.
CommandLineBuilder.FixCommandLineSwitch: Remove this completely.

All the tools/utilities bundled in .NET and Mono accept `/foo` and
`-foo` style switches, so, this isn't used anywhere. This should really
be done by the individual tasks themselves, and doesn't belong in the
public API. So, this is being removed completely.

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