Include license during build

Rather than including it only at packaging, we should include this
license as part of `dotnet build` and `dotnet publish`.

build.psm1

@@ -840,9 +840,6 @@ It consists of a cross-platform command-line shell and associated scripting lang
     $Source = Split-Path -Parent (Get-PSOutput -Options (New-PSOptions -Publish))
     Write-Verbose "Packaging $Source"
 
-    Write-Verbose "Copy license and third party notice to $Source"
-    Copy-Item "$PSScriptRoot\LICENSE.txt" "$Source" -Force -ErrorAction SilentlyContinue
-
     if ($IsWindows) {
         # Product Guid needs to be unique for every PowerShell version to allow SxS install
         $productGuid = [guid]::NewGuid()

src/powershell-unix/project.json

@@ -23,6 +23,7 @@
             "include": [
                 "*.so",
                 "*.dylib",
+                "../../LICENSE.txt",
                 "../../powershell.version"
             ]
         },
@@ -46,6 +47,7 @@
         "include": [
             "*.so",
             "*.dylib",
+            "../../LICENSE.txt",
             "../../powershell.version"
         ]
     },

src/powershell-win-core/project.json

@@ -22,6 +22,7 @@
                 }
             },
             "include": [
+            "../../LICENSE.txt",
                 "../../powershell.version"
             ]
         },
@@ -47,6 +48,7 @@
             "pwrshplugin.dll",
             "pwrshplugin.pdb",
             "Install-PowerShellRemoting.ps1",
+            "../../LICENSE.txt",
             "../../powershell.version"
         ]
     },