use msbuild if devenv not available in commandline mode

[Trass3r]

For me RudeBuildConsole checked for a non-existing HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\14.0\Setup\VS\EnvironmentDirectory.
I found it in the Wow64Node subtree, but my installation may be a bit broken, don't know.

But also if you use the new Build Tools on a CI server there is no devenv available.

Hence it may be a good idea to use msbuild as a fallback.

[Trass3r]

prototype: Trass3r@0d9f5aa