Bundle the System.Globalization.Native shim sources into the native AOT toolchain package and compile them automatically using C/C++ compiler on the target machine.

Compiling of the shim sources using C/C++ compiler is done during dotnet publish as follows:
  dotnet publish  /p:LocalSystemGlobalizationNative=1 -bl -r linux-x64

This change is 'opt-in', it is enabled only by using /p:LocalSystemGlobalizationNative=1

* Include existing pal_icushim_static.c by using STATIC_ICU define
* Use IlcSdkPath to copy shim source code

…pile defs

* Remove IlcHostPackagePath check
* StaticICULinking property is true/false
* Remove -g and -fPIC from definitions
* Use minimal warning level
* Remove -DHOST_AMD64
* Remove -O0
* Remove -fms-extensions -fwrapv
* Standardize on "local build"
* Rename build-nativeaot-shim-standalone.sh to build.sh
* Script name in the error message should match the actual script name
* Rename source_code to native/src

Test code:
$ cat Program.cs
using System.Globalization;

namespace CurrentCulture
{
	class Program
	{
		static void Main(string[] args)
		{
			double val = 1235.56;

			Console.WriteLine($"Current culture: {CultureInfo.CurrentCulture.Name}");
			Console.WriteLine(val);

			CultureInfo.DefaultThreadCurrentCulture = new CultureInfo("en-US");

			Console.WriteLine($"Current culture: {CultureInfo.CurrentCulture.Name}");
			Console.WriteLine(val);
		}
	}
}

$ cat hello-4.csproj
<Project Sdk="Microsoft.NET.Sdk">
 <PropertyGroup>
  <OutputType>Exe</OutputType>
  <TargetFramework>net7.0</TargetFramework>
  <RootNamespace>hello_4</RootNamespace>
  <ImplicitUsings>enable</ImplicitUsings>
  <Nullable>enable</Nullable>
 </PropertyGroup>

$ cat nuget.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
 <packageSources>
  <!--To inherit the global NuGet package sources remove the <clear/> line below -->
  <clear />
    <add key="repositoryPath" value="/home/ubuntu/runtime/artifacts/packages/Debug/Shipping" />
    <add key="dotnet7" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json" />
 </packageSources>
</configuration>

Test code build:
rm ./bin/Debug/net7.0/linux-arm64/native/hello-4
~/dotnet-sdk/dotnet clean
~/dotnet-sdk/dotnet publish /p:PublishAot=true /p:StaticICULinking=true -bl -r linux-arm64 --self-contained -v d 2>&1 > log
./bin/Debug/net7.0/linux-arm64/native/hello-4

Tested on x86-64 and arm64

*  Incorporated change to use only src/native/libs/System.Globalization.Native/CMakeLists.txt
*  Conditionalized CMakeLists.txt for local build
*  Moved the build.sh into parent as local_build.sh and removed local-build directory.
*  Rename STATIC_SHIM_COMPILE to LOCAL_BUILD

* Add "Using statically linked ICU" to compiling.md
* Remove define check for LOCAL_BUILD in CMakeLists.txt

Co-authored-by: Michal Strehovský <[email protected]>

…ft.DotNet.ILCompiler.pkgproj

Co-authored-by: Michal Strehovský <[email protected]>