Function buildNormalizedPathFixed

this returns "." instead of "". However, if all the inputs are "", or there

are no inputs, this still returns "" just like buildNormalizedPath.

Also, unlike buildNormalizedPath, this converts back/forward slashes to

native on BOTH Windows and Posix, not just on Windows.

Prototype

string buildNormalizedPathFixed(
  string[] paths
) pure nothrow @trusted;