!fixup! Do not NuGet.exe restore in parallel

- also disable cache use in `Restore` target and `NuGet.exe restore`

nit: Use `.\packages` folder in `Restore` target too

Author: dougbu

Runtime.msbuild

@@ -88,7 +88,7 @@
     <Message Importance="High" Text='%0A&gt; "$(NuGetExe)" restore "src\System.Net.Http.Formatting.NetCore\packages.config" ...'
       Condition=" '$(BuildPortable)' == 'true' " />
     <Exec Command='"$(NuGetExe)" restore "src\System.Net.Http.Formatting.NetCore\packages.config" ^
-        -PackagesDirectory packages -NonInteractive ^
+        -PackagesDirectory packages -DirectDownload -DisableParallelProcessing -NoCache -NonInteractive ^
         -Verbosity quiet -ConfigFile .nuget\NuGet.Config'
       Condition=" '$(BuildPortable)' == 'true' " />
     <!-- 2. Restore SDK-style test projects because legacy test projects depend on TestCommon. -->
@@ -99,7 +99,7 @@
     <!-- 3. Restore remaining legacy projects. -->
     <Message Importance="High" Text='%0A&gt; "$(NuGetExe)" restore "@(_NuGetPackagesAndSolutions)" ...' />
     <Exec Command='"$(NuGetExe)" restore "%(_NuGetPackagesAndSolutions.Identity)" ^
-        -PackagesDirectory packages -NonInteractive ^
+        -PackagesDirectory packages -DirectDownload -DisableParallelProcessing -NoCache -NonInteractive ^
         -Verbosity quiet -ConfigFile .nuget\NuGet.Config' />
     <Message Importance="High" Text='' />
   </Target>

build.cmd

@@ -38,6 +38,10 @@ if exist "%InstallDir%\MSBuild\15.0\Bin\MSBuild.exe" (
   goto BuildFail
 )
 
+REM Use same NuGet configuration when using `Restore` target.
+set "NUGET_PACKAGES=%CD%\packages"
+set RESTORENOCACHE=true
+
 if "%1" == "" goto BuildDefaults
 
 %MSBuild% Runtime.msbuild /m /nr:false /p:Platform="Any CPU" /p:Desktop=true /v:M ^