Use nuget 4 in bootstrappers

This avoids a bug with nuget restore on sln’s containing unsupported project types loaded on a given system (eg: UWP on Mac)

Author: Redth

build.ps1

@@ -49,7 +49,7 @@ Write-Host "Preparing to run build script..."
 $PS_SCRIPT_ROOT = split-path -parent $MyInvocation.MyCommand.Definition;
 $TOOLS_DIR = Join-Path $PSScriptRoot "tools"
 $NUGET_EXE = Join-Path $TOOLS_DIR "nuget.exe"
-$NUGET_URL = "http://dist.nuget.org/win-x86-commandline/latest/nuget.exe"
+$NUGET_URL = "https://dist.nuget.org/win-x86-commandline/v4.0.0/nuget.exe"
 $CAKE_EXE = Join-Path $TOOLS_DIR "Cake/Cake.exe"
 $PACKAGES_CONFIG = Join-Path $TOOLS_DIR "packages.config"
 

build.sh

@@ -68,7 +68,7 @@ fi
 # Download NuGet if it does not exist.
 if [ ! -f "$NUGET_EXE" ]; then
     echo "Downloading NuGet..."
-    curl -Lsfo "$NUGET_EXE" https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
+    curl -Lsfo "$NUGET_EXE" https://dist.nuget.org/win-x86-commandline/v4.0.0/nuget.exe
     if [ $? -ne 0 ]; then
         echo "An error occured while downloading nuget.exe."
         exit 1