Add patch to address build issue in msbuild

src/SourceBuild/tarball/patches/msbuild/0001-Updates-to-build-w-latest-roslyn.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MichaelSimons <msimons@microsoft.com>
+Date: Thu, 29 Sep 2022 19:04:13 +0000
+Subject: [PATCH] Updates to build w/latest roslyn
+
+Backport: https://github.com/dotnet/installer/pull/14616
+---
+ src/StringTools/InternableString.cs | 2 +-
+ src/StringTools/StringTools.csproj  | 1 -
+ 2 files changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/src/StringTools/InternableString.cs b/src/StringTools/InternableString.cs
+index f04d2a9e9..6a2bbcc34 100644
+--- a/src/StringTools/InternableString.cs
++++ b/src/StringTools/InternableString.cs
+@@ -33,7 +33,7 @@ namespace Microsoft.NET.StringTools
+             /// </summary>
+             private int _charIndex;
+ 
+-            internal Enumerator(ref InternableString str)
++            internal Enumerator(scoped ref InternableString str)
+             {
+                 _string = str;
+                 _spanIndex = -1;
+diff --git a/src/StringTools/StringTools.csproj b/src/StringTools/StringTools.csproj
+index fb76d6108..e44f8b3b6 100644
+--- a/src/StringTools/StringTools.csproj
++++ b/src/StringTools/StringTools.csproj
+@@ -6,7 +6,6 @@
+     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+     <IsPackable>true</IsPackable>
+     <GenerateReferenceAssemblySource>true</GenerateReferenceAssemblySource>
+-    <LangVersion>8.0</LangVersion>
+     <PackageId>Microsoft.NET.StringTools</PackageId>
+     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+