Revert license renaming (dotnet#42002)

Author: ViktorHofer

Diff for: .azure-ci.yml

@@ -13,7 +13,7 @@ trigger:
     - Documentation/*
     - CODE-OF-CONDUCT.md
     - CONTRIBUTING.md
-    - LICENSE
+    - LICENSE.TXT
     - PATENTS.TXT
     - README.md
     - SECURITY.md
@@ -29,7 +29,7 @@ pr:
     - Documentation/*
     - CODE-OF-CONDUCT.md
     - CONTRIBUTING.md
-    - LICENSE
+    - LICENSE.TXT
     - PATENTS.TXT
     - README.md
     - SECURITY.md

Diff for: Documentation/building/unix-instructions.md

@@ -78,7 +78,7 @@ There is one caveat: you must set the LANG in your shell to something other than
 ```sh
 export LANG=en_US.UTF-8
 ```
-Otherwise you may get errors like `PackagingException: File not found: '/home/dan/git/corefx/LICENSE'`. More info in [this issue](https://github.com/dotnet/corefx/issues/38608). It is possible this may occur on other distros, if LANG is set as above.
+Otherwise you may get errors like `PackagingException: File not found: '/home/dan/git/corefx/LICENSE.TXT'`. More info in [this issue](https://github.com/dotnet/corefx/issues/38608). It is possible this may occur on other distros, if LANG is set as above.
 
 We have not tested on WSL2 yet. If you try it out, we'd welcome an update.
 

Diff for: eng/Packaging.props

@@ -1,12 +1,12 @@
 <Project>
   <PropertyGroup>
     <PackageDescriptionFile>$(RepoRoot)pkg/descriptions.json</PackageDescriptionFile>
-    <PackageLicenseFile>$(RepoRoot)LICENSE</PackageLicenseFile>
+    <PackageLicenseFile>$(RepoRoot)LICENSE.TXT</PackageLicenseFile>
     <PackageThirdPartyNoticesFile>$(RepoRoot)THIRD-PARTY-NOTICES.TXT</PackageThirdPartyNoticesFile>
     <RuntimeIdGraphDefinitionFile>$(RepoRoot)pkg/Microsoft.NETCore.Platforms/runtime.json</RuntimeIdGraphDefinitionFile>
     <ReleaseNotes>https://go.microsoft.com/fwlink/?LinkID=799421</ReleaseNotes>
     <ProjectUrl>https://github.com/dotnet/corefx</ProjectUrl>
-    <LicenseUrl>https://github.com/dotnet/corefx/blob/master/LICENSE</LicenseUrl>
+    <LicenseUrl>https://github.com/dotnet/corefx/blob/master/LICENSE.TXT</LicenseUrl>
     <!-- defined in buildtools packaging.targets, but we need this before targets are imported -->
     <PackagePlatform Condition="'$(PackagePlatform)' == ''">$(Platform)</PackagePlatform>
     <PackagePlatform Condition="'$(PackagePlatform)' == 'amd64'">x64</PackagePlatform>