[CI] Added libClangSharp's license to the build output cache.

Author: PathogenDavid

.github/workflows/ClangSharp.Pathogen.yml

@@ -85,6 +85,7 @@ jobs:
             bin/llvm/${{matrix.rid}}/${{matrix.libclang-subpath}}
             bin/llvm/${{matrix.rid}}/lib/clang/
             external/llvm-project/clang/LICENSE.TXT
+            external/llvm-project/clang/tools/libclang/libClangSharp/LICENSE.md
 
       - name: Checkout LLVM
         if: steps.cached-llvm.outputs.cache-hit != 'true'
@@ -198,6 +199,7 @@ jobs:
             bin/llvm/${{matrix.rid}}/${{matrix.libclang-subpath}}
             bin/llvm/${{matrix.rid}}/lib/clang/
             external/llvm-project/clang/LICENSE.TXT
+            external/llvm-project/clang/tools/libclang/libClangSharp/LICENSE.md
 
       - name: Collect NuGet Packages
         uses: actions/upload-artifact@v2

.github/workflows/keep-cache-warm.yml

@@ -85,6 +85,7 @@ jobs:
             bin/llvm/${{matrix.rid}}/${{matrix.libclang-subpath}}
             bin/llvm/${{matrix.rid}}/lib/clang/
             external/llvm-project/clang/LICENSE.TXT
+            external/llvm-project/clang/tools/libclang/libClangSharp/LICENSE.md
 
       # ----------------------------------------------------------------------- Warm sccache cache
       - name: Load LLVM sccache