Remove global.json from solution file.

Author: Cesar Blum Silveira

KestrelHttpServer.sln

@@ -5,7 +5,6 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{7972A5D6-3385-4127-9277-428506DD44FF}"
 	ProjectSection(SolutionItems) = preProject
 		build.cmd = build.cmd
-		global.json = global.json
 		makefile.shade = makefile.shade
 		NuGet.Config = NuGet.Config
 	EndProjectSection