Fix for ambiguous function with VS2015 RTM
Fix for ambiguous function with VS2015 RTM

With the no-longer RC-version of VS2015, resolve for n-arg and
zero-arg became ambiguous. Solved by adding an additional first
argument.

Not yet tested on clang och c:o.

lukas-ke/faint-graphics-editor,lukas-ke/faint-graphics-editor,lukas-ke/faint-graphics-editor,lukas-ke/faint-graphics-editor