ENABLE_LIB_ONLY instead of building only the nghttp2 target

This configuration option is available as of nghttp2 1.9.0, so there
shouldmn't be issues if we would need to rebuild on old version.

.github/workflows/nghttp2.yml

@@ -32,9 +32,9 @@ jobs:
         id: virtuals
         run: powershell winlib-builder/scripts/compute-virtuals -version ${{github.event.inputs.php}} -arch ${{matrix.arch}}
       - name: Configure nghttp2
-        run: cd nghttp2 && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} -DBUILD_STATIC_LIBS=ON .
+        run: cd nghttp2 && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} -DENABLE_LIB_ONLY=ON -DBUILD_STATIC_LIBS=ON .
       - name: Build nghttp2
-        run: cd nghttp2 && cmake --build . --config RelWithDebInfo --target nghttp2
+        run: cd nghttp2 && cmake --build . --config RelWithDebInfo
       - name: Install nghttp2
         run: |
           cd nghttp2