Do not look for specific MSBuild version in build

Author: auduchinok

build.fsx

@@ -65,9 +65,6 @@ let gitName = "QuickGraph"
 
 // The url for the raw files hosted
 let gitRaw = environVarOrDefault "gitRaw" "https://raw.github.com/YaccConstructor"
-let MSBuild12 = (ProgramFilesX86 @@ @"\MSBuild\12.0\Bin")
-let MSBuild14 = (ProgramFilesX86 @@ @"\MSBuild\14.0\Bin")
-do setEnvironVar "MSBuild" (if (Directory.Exists(MSBuild12)) then MSBuild12 else MSBuild14)
 
 // --------------------------------------------------------------------------------------
 // END TODO: The rest of the file includes standard build steps