grpc-tools: build: Fix Windows build by skipping installing NuGet

Author: murgatroid99

packages/grpc-tools/build_binaries.ps1

@@ -19,9 +19,6 @@ $ErrorActionPreference = "Stop"
 <# https://stackoverflow.com/questions/16657778/install-nuget-via-powershell-script/26421187#comment107976901_48216538 #>
 
 [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]'Tls11,Tls12'
-
-Install-PackageProvider -Name NuGet -RequiredVersion 2.8.5.201 -Force
-Import-PackageProvider -Name NuGet -RequiredVersion 2.8.5.201
 Install-Module -Force -Name 7Zip4Powershell
 
 $env:Path += ";C:\Program Files\CMake\bin"
@@ -72,4 +69,4 @@ Copy-Item ($Base + "/Debug/grpc_node_plugin.exe") -Destination ($Base + "/build/
 Compress-7Zip -Path ($Base + "/build") -Format Tar -ArchiveFileName ($Base + "/Archive.tar")
 Compress-7Zip -Path ($Base + "/Archive.tar") -Format GZip -ArchiveFileName ($OutDir + "/win32-" + $Arch + ".tar.gz")
 
-& git clean -xdf .
+& git clean -xdf .