Fix libzstd builder to produce shippable artifacts

* we don't ship the programs (zstd.exe), so there is no need to build
  them
* we're fine with additionally shipping include/zdict.h and lib/cmake/
* we also ship the library PDBs

.github/workflows/libzstd.yml

@@ -34,13 +34,15 @@ jobs:
       - name: Patch libzstd
         run: cd libzstd && git apply --ignore-whitespace ..\winlib-builder\patches\libzstd.patch
       - name: Configure libzstd
-        run: cd libzstd\build\cmake && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} .
+        run: cd libzstd\build\cmake && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} -DZSTD_BUILD_PROGRAMS=OFF .
       - name: Build libzstd
         run: cd libzstd\build\cmake && cmake --build . --config RelWithDebInfo
       - name: Install libzstd
         run: |
           cd libzstd\build\cmake
           cmake --install . --config RelWithDebInfo --prefix ..\..\..\install
+          xcopy lib\RelWithDebInfo\libzstd.pdb ..\..\..\install\bin\*
+          xcopy lib\RelWithDebInfo\libzstd_a.pdb ..\..\..\install\lib\*
           cd ..\..
           copy COPYING ..\install
           copy LICENSE ..\install